Question

An element ‘X’ contains 7 electrons in M shell as valence electrons.
3
i) What is the atomic number of ‘X’?
ii) Identify whether ‘X’ is a metal or non-metal.
iii) Write the valency of X

Answer 1

Answer:

K L M

2 8 7

Therefore,

(i) Atomic No. of 'X' is 2+8+7=17

(ii)'X' is a non-metal

(iii)Valency of 'X' is 1

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Answer 2

Explanation:

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