Question

how many electrons in an atom with atomic number 30 can have (n+l) = 4?

a) 5
b) 6
c) 7
d) 8​

Answer 1

Answer:

(d)8

Explanation:

3p with 6 electrons and 4s with 2 electrons,total 8 electrons

Answer 2

answer : option (d) 8

explanation : atomic number of atom is 30.

so, electronic configuration of atom is 1s², 2s², 2p^6, 3s², 3p^6 , 4s², 3d^10

we know, n is principal quantum number.

and l is azimuthal quantum number.

here, there are two subshell where (n + l) = 4

for 3p^6 ⇒ n = 3 and l = 1 so, (n + l) = 4

so, number of electrons = 6

for 4s² ⇒n = 4 and l = 0 so, (n + l) = 4

so, number of electrons = 2

hence, total number of electrons = 6 + 2 = 8

hence, option (d) is correct choice.