Question

elements A,B,C,D,E have atomic no. 4,9,13,17,20 respectively . write their electronic distribution, determine their valency and classify them as metal and non metal

Answer 1

A-berilium,B-florine
C-aluminium
D-chlorine
E-calcium
A 2,2
B 2,7
C 2,8,3
D 2,8,7
E 2,8,8,2
VALENCY
A 2, metal
B 7,non metal
C 3, metal
D 7, non metal
E 2 metal

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Answer 2

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A (4) - Beryllium
B (9) - Fluorine
C (13) - Aluminum
D (17) - Chlorine
E (20) - Calcium

Electronic configuration:-
A- 2,2
B- 2,7
C-2,8,3
D-2,8,7
E-2,8,8,2

Valency:-
A-2
B-7.
C-3
D-7
E-2

metal or non metal:-
A- Metal
B-Non metal
C-metal
D-Non metal
E -metal

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