Question

Determine effective nuclear charge for last electron

of Oxygen​

Answer 1

The effective nuclear charge for the last electron of oxygen atom is 4.55

Explanation:

"Z^∗" is the expression for the effective nuclear charge.  

Mathematically it can be written as;

Z^∗ =Z  - S

Here

• Z = The nuclear charge
• S = The shielding constant

For oxygen atom;

The atomic number of oxygen atom "Z" = 8

Shielding effect "S" = 3.45

Now 2 x 0.85 + 5 x 0.35

Z^* = Z - S = 8 - 3.45 = 4.55

Thus, the effective nuclear charge for the last electron of oxygen atom is 4.55