Question

In the modern periodic table of the element calcium is surrounded by elements with atomic numbers 12, 19, 21 and 58 which of these elements has physical and chemical properties assembling those of calcium And why

Answer 1

The element with atomic no 12 resembles Ca because is the has same number of valence electrons as Ca i.e 2 valence electrons.

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).