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Recent questions tagged element


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Suppose the lake is considered safe for use after only \(1 \mathrm{~kg}\) of the plutonium239 remains. How many years will this take?
0 answers 24 views
Suppose the lake is considered safe for use after only \(1 \mathrm{~kg}\) of the plutonium239 remains. How many years will this take?Plutonium-239 is part of the highly radioactive waste that nuclear power plans produce. The half-life of plutonium-239 is 24,110 years. Suppose that \ ...
by Pieter Gold Status
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asked in Mathematics Feb 4
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Does an 8-dimensional vector space contain linear subspaces \(V_{1}, V_{2}, V_{3}\) with no common non-zero element, such that
0 answers 139 views
Does an 8-dimensional vector space contain linear subspaces \(V_{1}, V_{2}, V_{3}\) with no common non-zero element, such thatDoes an 8-dimensional vector space contain linear subspaces \(V_{1}, V_{2}, V_{3}\) with no common non-zero element, such that   a). \(\operato ...
by MathsGee Platinum
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asked in Mathematics Jan 20
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Is platinum a chemical element?
0 answers 67 views
Is platinum a chemical element?Is platinum a chemical element? ...
by MathsGee Platinum
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asked in Physics & Chemistry Jan 3
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What is the difference between absolute and relative change?
1 answer 101 views
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If you start with 24 grams of a radioactive element with a half-life of one month, how many grams of the radioactive element will be left after 2 months?

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What do we mean by the electronic configuration of an atom?
1 answer 181 views
What do we mean by the electronic configuration of an atom?What do we mean by the electronic configuration of an atom? ...
by MathsGee Platinum
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asked in Physics & Chemistry Jul 29, 2021
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Show that the statement "If $S \subset \mathbb{R}$ contains a maximum and a minimum element, then $\mathrm{S}$ is compact" is false by finding a counterexample.

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Show that every compact subset $S \subset \mathbb{R}$ contains a maximum and a minimum element.
1 answer 414 views
Show that every compact subset $S \subset \mathbb{R}$ contains a maximum and a minimum element.Show that every compact subset $S \subset \mathbb{R}$ contains a maximum and a minimum element. ...
by Student SIlver Status
(10,892 points)
asked in Mathematics May 10, 2021
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The atomic number of an element is determined by the number of …
1 answer 203 views
The atomic number of an element is determined by the number of …The atomic number of an element is determined by the number of … a. protons + neutrons b. protons + neutrons+ electrons c. nucleons d. protons ...
by CT Diamond
(48,306 points)
asked in Physics & Chemistry Aug 23, 2020
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​The letters He represents ............................... in the periodic table.
1 answer 137 views
​The letters He represents ............................... in the periodic table. The letters He represents ............................... in the periodic table. A.  Hectic elements B.  Helium C.  Hydroge ...
by CT Diamond
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asked in Physics & Chemistry Aug 22, 2020
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Element M belongs to Group III of the periodic table.
0 answers 93 views
Element M belongs to Group III of the periodic table.<p>Element M belongs to Group III of the periodic table. </p> <ol>     <li>How many electrons do ...
by anonymous
asked in Physics & Chemistry Jun 19, 2020
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+1 is the ionic charge for element in group...
2 answers 105 views
+1 is the ionic charge for element in group...+1 is the ionic charge for element in group... ...
by MathsGee Platinum
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asked in Physics & Chemistry Jun 13, 2020
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What is the element symbol of Berillium?
1 answer 128 views
What is the element symbol of Berillium?What is the element symbol of Berillium? ...
by MathsGee Platinum
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asked in Physics & Chemistry Jun 13, 2020
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What is the relationship of valence electrons to the position of the elements in the periodic table?
1 answer 1.9K views
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Do you understand what is meant by the terms atomic number, mass number, isotope, element and ion?
1 answer 155 views
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Is it true that in a compound, atoms of two or more different kinds are chemically bonded in some fixed ratio.
1 answer 164 views
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Are the atoms all of the same kind for all elements on periodic table?
1 answer 228 views
Are the atoms all of the same kind for all elements on periodic table?Are the atoms all of the same kind for all elements on periodic table? ...
by Joshua Mwanza Diamond
(51,622 points)
asked in Physics & Chemistry May 16, 2020
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After many decades of studying atoms, scientists discovered that all atoms are made up of three different kinds of sub-atomic particles. They are called...

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Are atoms really the smallest particles?
1 answer 117 views
Are atoms really the smallest particles?Are atoms really the smallest particles? ...
by Joshua Mwanza Diamond
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asked in Physics & Chemistry May 16, 2020
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In your own words, explain what you think the Periodic Table is.
1 answer 1.1K views
In your own words, explain what you think the Periodic Table is.In your own words, explain what you think the Periodic Table is. ...
by Joshua Mwanza Diamond
(51,622 points)
asked in Physics & Chemistry May 16, 2020
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What is the smallest unit of an element in the periodic table called?
1 answer 1.5K views
What is the smallest unit of an element in the periodic table called?What is the smallest unit of an element in the periodic table called? ...
by MathsGee Platinum
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asked in Physics & Chemistry May 4, 2020
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Find the 16th term of the sequence $11; 10\frac{2}{5}; 9\frac{4}{5};...$
1 answer 94 views
Find the 16th term of the sequence $11; 10\frac{2}{5}; 9\frac{4}{5};...$Find the 16th term of the sequence $11; 10\frac{2}{5}; 9\frac{4}{5};...$ ...
by MathsGee Platinum
(118,646 points)
asked in Mathematics Apr 30, 2020
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Find the 13th term of the sequence $−12;−8;−4;...$
1 answer 765 views
Find the 13th term of the sequence $−12;−8;−4;...$Find the 13th term of the sequence $−12;−8;−4;...$ ...
by MathsGee Platinum
(118,646 points)
asked in Mathematics Apr 28, 2020
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Define the term covalent bond.
1 answer 423 views
Define the term covalent bond.Define the term covalent bond. ...
by Joshua Mwanza Diamond
(51,622 points)
asked in Physics & Chemistry Apr 26, 2020
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A substance was tested and analysed.
1 answer 86 views
A substance was tested and analysed.A substance was tested  and analysed. It was found to contain 40% carbon, 6,67% hydrogen and 53,33% oxygen. Determine the molecular formula if t ...
by Joshua Mwanza Diamond
(51,622 points)
asked in Physics & Chemistry Apr 25, 2020
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Define the term a mole of a substance.
1 answer 658 views
Define the term a mole of a substance.Define the term a mole of a substance. ...
by Joshua Mwanza Diamond
(51,622 points)
asked in Physics & Chemistry Apr 25, 2020
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Explain the meaning of the term hydrated.
1 answer 85 views
Explain the meaning of the term hydrated.Explain the meaning of the term hydrated. ...
by Joshua Mwanza Diamond
(51,622 points)
asked in Physics & Chemistry Apr 25, 2020
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Write down the valency of a chlorine atom.
1 answer 295 views
Write down the valency of a chlorine atom.Write down the valency of a chlorine atom. ...
by Joshua Mwanza Diamond
(51,622 points)
asked in Physics & Chemistry Apr 25, 2020
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Describe metallic structure.
1 answer 303 views
Describe metallic structure.Describe metallic structure. ...
by Joshua Mwanza Diamond
(51,622 points)
asked in Physics & Chemistry Apr 25, 2020
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Element Y occurs as these isotopes in the following proportions:
1 answer 371 views
Element Y occurs as these isotopes in the following proportions:Element Y occurs as these isotopes in the following proportions: Y – 28(92,23%); Y – 29(4,68%); Y – 30(3,09%) Calculate the relative atomic mass of el ...
by Joshua Mwanza Diamond
(51,622 points)
asked in Physics & Chemistry Apr 25, 2020
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What is chemical symbol of element with atomic number of 18?
1 answer 167 views
What is chemical symbol of element with atomic number of 18?What is chemical symbol of element with atomic number of 18? ...
by Joshua Mwanza Diamond
(51,622 points)
asked in Physics & Chemistry Apr 25, 2020
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What is chemical symbol of element with atomic number of 14?
1 answer 172 views
What is chemical symbol of element with atomic number of 14?What is chemical symbol of element with atomic number of 14? ...
by Joshua Mwanza Diamond
(51,622 points)
asked in Physics & Chemistry Apr 25, 2020
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What is chemical symbol of element with atomic number of 11?
1 answer 162 views
What is chemical symbol of element with atomic number of 11?What is chemical symbol of element with atomic number of 11? ...
by Joshua Mwanza Diamond
(51,622 points)
asked in Physics & Chemistry Apr 25, 2020
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Define the term atomic number.
1 answer 149 views
Define the term atomic number.Define the term atomic number. ...
by Joshua Mwanza Diamond
(51,622 points)
asked in Physics & Chemistry Apr 25, 2020
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What is a heterogeneous mixture?
1 answer 101 views
What is a heterogeneous mixture?What is a heterogeneous mixture? ...
by Joshua Mwanza Diamond
(51,622 points)
asked in Physics & Chemistry Apr 25, 2020
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Define the term element.
1 answer 221 views
Define the term element.Define the term element. ...
by Joshua Mwanza Diamond
(51,622 points)
asked in Physics & Chemistry Apr 25, 2020
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One mole of H2SO4 contains …
1 answer 1.4K views
One mole of H2SO4 contains …One mole of $H_2SO_4$ contains … A 7 atoms. B 1 molecule. C 6,02×10^23 molecules. D 42,14×10^23 molecules. ...
by Joshua Mwanza Diamond
(51,622 points)
asked in Physics & Chemistry Apr 25, 2020
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Different isotopes of the same element have different …
1 answer 3.5K views
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Which element is a light, silvery metal with a valency of 3 ?
1 answer 801 views
Which element is a light, silvery metal with a valency of 3 ?Which element is a light, silvery metal with a valency of 3  ? ...
by MathsGee Platinum
(118,646 points)
asked in Physics & Chemistry Apr 20, 2020
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Which element has 4 protons?
1 answer 266 views
Which element has 4 protons?Which element has 4 protons? ...
by MathsGee Platinum
(118,646 points)
asked in Physics & Chemistry Apr 20, 2020
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Which element has the smallest atoms ?
1 answer 94 views
Which element has the smallest atoms ?Which element has the smallest atoms ? ...
by MathsGee Platinum
(118,646 points)
asked in Physics & Chemistry Apr 20, 2020
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What element is a yellow solid non-metal ?
1 answer 685 views
What element is a yellow solid non-metal ?What element is a yellow solid non-metal  ? ...
by MathsGee Platinum
(118,646 points)
asked in Physics & Chemistry Apr 20, 2020
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Is water an element, compound or mixture?
1 answer 370 views
Is water an element, compound or mixture?Is water an element, compound or mixture? ...
by MathsGee Platinum
(118,646 points)
asked in Physics & Chemistry Apr 20, 2020
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Which element ignites with a popping sound?
1 answer 147 views
Which element ignites with a popping sound?Which element ignites with a popping sound? ...
by MathsGee Platinum
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asked in Physics & Chemistry Apr 20, 2020
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What is an element that sinks in water, and makes a ringing sound when hit?
1 answer 1.6K views
What is an element that sinks in water, and makes a ringing sound when hit?What is an element that sinks in water, and makes a ringing sound when hit? ...
by MathsGee Platinum
(118,646 points)
asked in Physics & Chemistry Apr 20, 2020
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What element is used to make semi-conductors (computer chips)?
1 answer 104 views
What element is used to make semi-conductors (computer chips)?What element is used to make semi-conductors (computer chips)? ...
by MathsGee Platinum
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asked in Physics & Chemistry Apr 20, 2020
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Which metal element is used in making wires?
1 answer 245 views
Which metal element is used in making wires?Which metal element is used in making wires? ...
by MathsGee Platinum
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asked in Physics & Chemistry Apr 20, 2020
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Which metal element is used in foil?
1 answer 106 views
Which metal element is used in foil?Which metal element is used in foil? ...
by MathsGee Platinum
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asked in Physics & Chemistry Apr 20, 2020
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Which periodic table element is component of gunpowder that smells like rotten eggs?
1 answer 435 views
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What is the most common element in the earth's atmosphere?
1 answer 574 views
What is the most common element in the earth's atmosphere?What is the most common element in the earth's atmosphere? ...
by MathsGee Platinum
(118,646 points)
asked in Physics & Chemistry Apr 20, 2020
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