Question

in the modern period Table calcium is surrounded by the elements with atomic number 12,19,21 and 38 which of these have physical and chemical properties resembling calcium?(2 marks)question​

Answer 1

This is how it looks on Periodic table :

Mg(12)

K(19) Ca(20) Sc(21)

Sr(38)

Here K, Ca, Sc are of same period

and Mg, Ca, Sr are of same group

Elements in same group will have similar properties.

Therefore, Mg(12) and Sr(38) resemble Calcium.

Hope this clears your doubt.

Answer 2

Explanation:

The element with atomic number 12 has same chemical properties as that of calcium. This is because both of them have same number of valence electrons (2).