Question

28. An element 'X' has following electronic configuration
k 2
L 8
м 6
(a) To which group of the periodic table does element 'X belong?
(b) To which period of the periodic table does element 'X' belong?
(c) State the number of valence electrons present in element 'X'.
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Answer 1

Answer:

(a) Group 16

(b) Period 3

(c) Valence Electrons = 6

Explanation:

(a) Group No. For Valency >4 => 10 + (Valence Electrons) => 10 + 6 => 16

(b) Period No. = No. of Shells => k,l,m => 3

Answer 2

Answer:

1 . Since ‘X’ has three energy shells and period number of an element is equal to the number  of energy shells, X belongs to 3rd period.

2 . X has 6 valence electrons it belongs to group 16.

3.  Valency will be 2. To acquire noble gas configuration it will gain 2 electrons.