Which of the following element lose three electrons to get octet in its outer shell? 

Monjur Alahi

Which of the following element lose three electrons to get octet in its outer shell? 

A) Cs 

B) Mg 

C) O 

D) Al


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Salim Ahmed Kawsar

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Correct option is  D) Al

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Correct option is B) Al

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If number of electrons in M-shell is half of K-shell then atomic number and name of element. 

B) 11, Sodium

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C) a → ii, b → iv, c → i, d → iii

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C) a→iii, b→i, c→iv, d→ii

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Correct option is  D) He

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 Correct option is  D) 4

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Correct option is  A) 2

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C) Both David and Dravid are correct.

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Correct option is A) valency

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Correct option is A) stable

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