Question

An element E has following electronic configuration:; K L M; 2 8 6; (a) To which group of the periodic table does element E belong?; (b) To which period of the periodic table does element E belong?; (c) State the number of valence electrons present in element E.; (d) State the valency of the element E.(All India - 2012)

Answer 1

Answer:

a) group 16

b) period 3

c) valence electron 6

d) valency 2

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Answer 2

Group- 16

Period- 3

Valance electrons-6

Valancy-2

• An element E has the following electronic configuration: K L M; 2 8 6. Thus its electronic configuration is as follows-
• ${1s}^{2} {2s}^{2} {2p}^{6} {3s}^{2} {3p}^{4}$
• Thus it has an atomic number 2+8+6=16. So, the element is Sulfur.
• It resides at group 16 and period 3 of the periodic table.
• The number of valance electrons is 6 as it has 6 electrons in the valance shell M.
• The valency is 2.