SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Sodium (Na) is a highly reactive element. Which characteristic of sodium is responsible for its reactivity?
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it has 11 protons
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its atomic mass is 23
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it is a nonmetal
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it has one valence electron
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Explanation:
Detailed explanation-1: -Alkali metals are highly reactive because they readily lose the single electron in their outermost shell.
Detailed explanation-2: -Q: Why does having just one valence electron make group 1 elements very reactive? A: With just one valence electron, group 1 elements are “eager” to lose that electron. Doing so allows them to achieve a full outer energy level and maximum stability.
Detailed explanation-3: -As sodium has an atomic number of 11, the first and second shell will be filled and the third shell will have 1 electron. Valence electrons (VE) are the electrons in the outer shell of an atom. Hence sodium has 1 valence electron.
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