The effective nuclear charge of Mg (Z = 12) is

Question

The effective nuclear charge of Mg (Z = 12) is (A) 3 (B) 2 (C) 4 (D) 1

Tardigrade Admin · Accepted Answer

Mg(Z=12) E.C. beginmatrix1 s2&2 s2 2p6&3 s2 (n-2)&(n-1)&n σ of 2e- in (n-2)th&8e in(n-1)th&1e -in nth orbit endmatrix beginmatrix2.0&+&6.8&+&0.35=9.15 endmatrix Z* =12-9.15=2.85 ≈3

Q. The effective nuclear charge of Mg (Z = 12) is

3

2

4

1

$M g (Z = 12)$
$E . C . 1 s^{2} (n - 2) σ o f 2 e^{-} in (n - 2)^{t h} 2 s^{2} 2 p^{6} (n - 1) 8 e in (n - 1)^{t h} 3 s^{2} n 1 e^{-} in n^{t h} or bi t$
$2.0 + 6.8 + 0.35 = 9.15$
$Z^{*} = 12 - 9.15 = 2.85 \approx 3$

Q. The effective nuclear charge of Mg (Z = 12) is

3

2

4

1

Mg(Z=12) E.C.1s2(n−2)σof2e−in(n−2)th​2s22p6(n−1)8ein(n−1)th​3s2n1e−innthorbit​ 2.0​+​6.8​+​0.35=9.15​ Z∗=12−9.15=2.85≈3

$M g (Z = 12)$
$E . C . 1 s^{2} (n - 2) σ o f 2 e^{-} in (n - 2)^{t h} 2 s^{2} 2 p^{6} (n - 1) 8 e in (n - 1)^{t h} 3 s^{2} n 1 e^{-} in n^{t h} or bi t$
$2.0 + 6.8 + 0.35 = 9.15$
$Z^{*} = 12 - 9.15 = 2.85 \approx 3$