Question

please please anyone tell me how the periodic trends change along the period and down the group change for effective nucleur charge.​

Answer 1

Answer:

from 1) left to right along period increases

2) top to bottom along group decreases

Explanation:

1) from left to right :

# Due to increase in no. of proton effective nuclear charge increases as it makes the atom to hold the outer electrons closer and tighter to the nucleus

# Here screening effect is constant

2) from top to bottom :

# Here its due to increase in extra shell of an atom which leads to increase in no.of electron in outermost shell and becoz of this screening effect (or) shielding effect of electron increases and effective nuclear charge decreases

To make it simple just keep in mind about atomic radii :

$atomic \: radius \: \: \frac{1}{ \alpha } \: screening \: effect$

# from top to bottom atomic radii increases - screening effect decreases

# from left to right atomic radius decreases - screening effect increases