Question

Out of the two element X and Y which has bigger atomic radius. x has atomic number =18and atomic mass 40 y has atomic number =20 and atomic mass 40 ? ​

Answer 1

Answer:

X is argon, y is calcium.

Actually, Cl has a greater atomic radius than Ar because of the greater attraction from the nucleus in Ar.

Answer 2

Answer: element X has bigger atomic radius

Explanation: since element X is placed before element Y in 3rd period of periodic table, the nuclear charge of element X is less than element Y.  since the attraction between nucleus and electrons (lesser electrons compared to Y)  is weak in element X the electron cloud is larger in X