GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In which shel lor energy level are the valence electrons of the elements in period 2 found?
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1
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2
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3
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4
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Explanation:
Detailed explanation-1: -The elements lithium (Li) through neon (Ne) make up the second period of the periodic table. Their valence electrons are in the 2nd energy level (n=2), from 2s1 for lithium to 2s2 2p6 for neon.
Detailed explanation-2: -Group 2 has 2 valence electrons.
Detailed explanation-3: -Examples of some neutral atoms and their electron configurations are shown below. In this table, you can see that helium has a full valence shell, with two electrons in its first and only, 1n, shell.
Detailed explanation-4: -The alkaline earth metals have two valence electrons in their highest-energy orbitals (ns2).
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