Question

An element has atomic number 20. Where would you expect this element in the

periodic table and why?​

Answer 1

Answer:

Calcium is the element with 'atomic number' 20. Explanation: Calcium belongs to group 2, period 4, and block 's' in the periodic table. This is because calcium is an 'alkaline earth metal' and alkaline earth metals are placed in group 2 in the periodic table.