AH2 is formed when element A reacts with hydrogen. Then the number of electrons in valence shell of A are generally 

Monjur Alahi

AH2 is formed when element A reacts with hydrogen. Then the number of electrons in valence shell of A are generally 

A) 2 

B) 3 

C) 5 

D) 8


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Correct option is  A) 2

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If the valence shell electronic configuration of an element is 3s^2 3p^1, in which block of the periodic table is it placed?

The element having valence shell electronic configuration 3s2 3p1 must be placed in the p - block of the periodic table as its last electron enters in p-subshell (3p).

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If an element has 3 electrons in the M-shell then the element is ………………… 

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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The maximum number of electrons accommodated in a sub shell with Azimuthal quantum number (angular momentum quantum number) l is ………………….

Correct option is  B) 4l + 2

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valence of group IA — i) 4  , valence of group IVA — ii) 0 

D) a → iii, b → i, c → iv, d → ii

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 Correct option is  D) 4

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The valence shell of the central atom of a molecule has four bond pairs of electrons. Shape of the molecule is ……………..

D) Tetrahydral

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The number of electrons in the valence shell of semiconductor is …………… 

Correct option is: (B) equal to 4

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