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Answer the following questions:
Answer variants:
Neon (2, 8)
Lithium
Elements in the same column or group as oxygen have valency of three and have three valence electrons.
Carbon (2, 4)
1. Which element has
(a) two shells, both of which are completely filled with electrons ?
(a) two shells, both of which are completely filled with electrons ?
2. Which element has
(e) twice as many electrons in its second shell as in its first shell?
(e) twice as many electrons in its second shell as in its first shell?
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