An element ‘X’ has 8 electrons in the M shell when it gains one el

1.	An element ‘X’ has 8 electrons in the M shell when it gains one electron. Which statements given below are not correct about the element ‘X’? (a) It belongs to 3rd period in the modern periodic table (b) It has a valency of 7 (c) It belongs to 18th group in the modern periodic table (d) its valency is 1 (A) a and b (B) b and c (C) b and d (D) a and d
Answer» (B) b and c The element ‘X’ has 7 electron is ‘M’ shell. K = 2 L = 8 M = 7 Atomic number = 17 Here (a) period – 3 element (b) Valency = 1 Valency = 8 = valence electron (c) be long’s to 17th group ( B & C) are wrong

An element ‘X’ has 8 electrons in the M shell when it gains one electron. Which statements given below are not correct about the element ‘X’? (a) It belongs to 3rd period in the modern periodic table (b) It has a valency of 7 (c) It belongs to 18th group in the modern periodic table (d) its valency is 1 (A) a and b (B) b and c (C) b and d (D) a and d

Answer»

(B) b and c

The element ‘X’ has 7 electron is ‘M’ shell.

K = 2

L = 8

M = 7

Atomic number = 17

Here (a) period – 3 element

(b) Valency = 1

Valency = 8 = valence electron

( B & C) are wrong

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