Question

21. The atomic number of an element is 20. In which period of the modern periodic
table, could this element be placed? Why? How will you decide whether the
element is a metal or a non-metal?
Lad when​

Answer 1

Answer:

if it loose electron means it is a metal except hydrogen

if it gain means it is a non metal

Answer 2

• The element which atomic number of 20 is Calcium
• It belongs to Group 2, Period 4 of the periodic table

If the element loses electron it is a Metal

But if it gains it is a non metal

Calcium loses electron so it is A metal