# 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?
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 \ ...
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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
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 &nbsp; a). \(\operato ...
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Is platinum a chemical element?
Is platinum a chemical element?Is platinum a chemical element? ...
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What is the difference between absolute and relative change?
What is the difference between absolute and relative change?What is the difference between absolute and relative change? ...
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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?
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?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 mont ...
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What do we mean by the electronic configuration of an atom?
What do we mean by the electronic configuration of an atom?What do we mean by the electronic configuration of an atom? ...
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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.
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.Show that the statement &quot;If $S \subset \mathbb{R}$ contains a maximum and a minimum element, then $\mathrm{S}$ is compact&quot; is false by findi ...
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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.Show that every compact subset $S \subset \mathbb{R}$ contains a maximum and a minimum element. ...
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The atomic number of an element is determined by the number of …
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 ...
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​The letters He represents ............................... in the periodic table.
​The letters He represents ............................... in the periodic table. The letters&nbsp;He represents ............................... in the periodic table. A.&nbsp; Hectic elements B.&nbsp; Helium C.&nbsp; Hydroge ...
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Element M belongs to Group III of the periodic table.
Element M belongs to Group III of the periodic table.&lt;p&gt;Element M belongs to Group III of the periodic table.&amp;nbsp;&lt;/p&gt; &lt;ol&gt; &nbsp;&nbsp;&nbsp;&nbsp;&lt;li&gt;How many electrons do ...
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+1 is the ionic charge for element in group...
+1 is the ionic charge for element in group...+1 is the ionic charge for element in group... ...
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What is the element symbol of Berillium?
What is the element symbol of Berillium?What is the element symbol of Berillium? ...
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What is the relationship of valence electrons to the position of the elements in the periodic table?
What is the relationship of valence electrons to the position of the elements in the periodic table?What is the relationship of valence electrons to the position of the elements in the periodic table? ...
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Do you understand what is meant by the terms atomic number, mass number, isotope, element and ion?
Do you understand what is meant by the terms atomic number, mass number, isotope, element and ion?Do you understand what is meant by the terms atomic number, mass number, isotope, element and ion? ...
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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.
Is it true that in a compound, atoms of two or more different kinds are chemically bonded in some fixed ratio.Is it true that in a compound, atoms of two or more different kinds are chemically bonded in some fixed ratio. ...
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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?Are the atoms all of the same kind for all elements on periodic table? ...
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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...
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...After many decades of studying atoms, scientists discovered that all atoms are made up of three different kinds of sub-atomic particles. They are call ...
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Are atoms really the smallest particles?
Are atoms really the smallest particles?Are atoms really the smallest particles? ...
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In your own words, explain what you think the Periodic Table is.
In your own words, explain what you think the Periodic Table is.In your own words, explain what you think the Periodic Table is. ...
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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?What is the smallest unit of an element in the periodic table called? ...
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Find the 16th term of the sequence $11; 10\frac{2}{5}; 9\frac{4}{5};...$
Find the 16th term of the sequence $11; 10\frac{2}{5}; 9\frac{4}{5};...$Find the 16th term of the sequence $11; 10\frac{2}{5}; 9\frac{4}{5};...$ ...
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Find the 13th term of the sequence $−12;−8;−4;...$
Find the 13th term of the sequence $−12;−8;−4;...$Find the 13th term of the sequence $−12;−8;−4;...$ ...
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Define the term covalent bond.
Define the term covalent bond.Define the term covalent bond. ...
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A substance was tested and analysed.
A substance was tested and analysed.A substance was tested &nbsp;and analysed. It was found to contain 40% carbon, 6,67% hydrogen and 53,33% oxygen. Determine the molecular formula if t ...
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Define the term a mole of a substance.
Define the term a mole of a substance.Define the term a mole of a substance. ...
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Explain the meaning of the term hydrated.
Explain the meaning of the term hydrated.Explain the meaning of the term hydrated. ...
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Write down the valency of a chlorine atom.
Write down the valency of a chlorine atom.Write down the valency of a chlorine atom. ...
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Describe metallic structure.
Describe metallic structure.Describe metallic structure. ...
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Element Y occurs as these isotopes in the following proportions:
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 ...
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What is chemical symbol of element with atomic number of 18?
What is chemical symbol of element with atomic number of 18?What is chemical symbol of element with atomic number of 18? ...
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What is chemical symbol of element with atomic number of 14?
What is chemical symbol of element with atomic number of 14?What is chemical symbol of element with atomic number of 14? ...
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What is chemical symbol of element with atomic number of 11?
What is chemical symbol of element with atomic number of 11?What is chemical symbol of element with atomic number of 11? ...
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Define the term atomic number.
Define the term atomic number.Define the term atomic number. ...
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What is a heterogeneous mixture?
What is a heterogeneous mixture?What is a heterogeneous mixture? ...
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Define the term element.
Define the term element.Define the term element. ...
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One mole of H2SO4 contains …
One mole of H2SO4 contains …One mole of $H_2SO_4$ contains &amp;hellip; A 7 atoms. B 1 molecule. C 6,02&amp;times;10^23 molecules. D 42,14&amp;times;10^23 molecules. ...
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Different isotopes of the same element have different …
Different isotopes of the same element have different …Different isotopes of the same element have different … ...
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Which element is a light, silvery metal with a valency of 3 ?
Which element is a light, silvery metal with a valency of 3 ?Which element is a light, silvery metal with a valency of 3 &nbsp;? ...
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Which element has 4 protons?
Which element has 4 protons?Which element has 4 protons? ...
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Which element has the smallest atoms ?
Which element has the smallest atoms ?Which element has the smallest atoms ? ...
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What element is a yellow solid non-metal ?
What element is a yellow solid non-metal ?What element is a yellow solid non-metal &nbsp;? ...
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Is water an element, compound or mixture?
Is water an element, compound or mixture?Is water an element, compound or mixture? ...
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Which element ignites with a popping sound?
Which element ignites with a popping sound?Which element ignites with a popping sound? ...
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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?What is an element that sinks in water, and makes a ringing sound when hit? ...
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What element is used to make semi-conductors (computer chips)?
What element is used to make semi-conductors (computer chips)?What element is used to make semi-conductors (computer chips)? ...
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Which metal element is used in making wires?
Which metal element is used in making wires?Which metal element is used in making wires? ...
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Which metal element is used in foil?
Which metal element is used in foil?Which metal element is used in foil? ...
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Which periodic table element is component of gunpowder that smells like rotten eggs?