Question

In the modern periodic
table, sulphur (atomic
number 16) is surrounded
by elements with atomic
number 8, 15 and 17?
Which of these have
physical and chemical
properties resembling
sulphur?
Element with atomic no. 8
Element with atomic number
15
Element atomic number 17
All the above​

Answer 1

The electronic configuration of Ca(20) is =2,8,8,2

Number of valance electrons =2

The elements with atomic number 12 and 38 both have 2 valence electrons in their outer shell but elements with 19 has 1 valance electron and 21 has 3 valance electrons. Therefore elements with atomic number 12 and 38 have physical and chemical properties resembling calcium.

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