Question

1-if the subshell wise electronic configuration of an atom is 1s² 2s²3p6 3s²(answer the below question)
a- how many shells are present in this atom?
b- which are the subshell of each shell?
c- which is the subshell to which the last electron was added?
d- what is the total number of electrons in the atom?
e- what is its atomic number?​

Answer 1

Answer:

a. 3 shells are present

b. K shell - 1s subshell

L shell - 2s, 2p subshell

M shell - 3a subshell

c. The last electron was added to the 3s subshell

d. Total number of electrons in this atom is 12

e. The atomic number is 12