Shielding Effect

Q.

What is screening Effect?

Q. The effective nuclear charge for $4s$ electrons of $Zn$ will be

1. 26.85
2. 4.35
3. 15.3
4. 10

Q. $Z_{eff}$ for 4s electron in Zn (atomic no. = 30) is:

1. 1.65
2. 14
3. 12.85
4. 4.35

Q. The atomic sizes of $Ga$ and $Al$ are almost same because

1. Poor shielding effect of the electrons in $d$ orbitals, effective nuclear charge increases in gallium.

2. More shielding effect of $d$ electrons

3. Poor shielding effect of $f$ orbitals in gallium

4. High screening effect of $3s,3pand3d$ electrons.

Q. The screening effect of $d-$electrons is

1. Equal to the $p-$electrons
2. More than $p-$electrons
3. Same as $f-$electrons
4. Less than $p-$electrons

Q. Due to screening effect of electrons in an atom, IE

1. decreases
2. increases
3. has no change