GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What is a valence?
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The outer electron cloud of an atom.
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A subatomic particle.
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The total amount of matter in something.
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A material that cannot be split into simpler materials; each element is made of only one kind of atom.
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Explanation:
Detailed explanation-1: -The number of electrons in the outermost shell of a particular atom determines its reactivity, or tendency to form chemical bonds with other atoms. This outermost shell is known as the valence shell, and the electrons found in it are called valence electrons.
Detailed explanation-2: -This tendency is called the octet rule, because each bonded atom has 8 valence electrons including shared electrons.
Detailed explanation-3: -Hydrogen, lithium, and sodium, as group 1 elements, have just one electron in their outermost shells. They are unstable as single atoms, but can become stable by losing or sharing their one valence electron. Among this Hydrogen is the element having only one shell and one valence electron.
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