Question

What does the 3 indicate in 1s22s22p63s1?

the third shell
third sublevel
last shell has 3 electrons
none of the above

Answer 1

The 3 indicates the third electron shell. (Which has only 1 electron in it in this configuration)

Hope this helps! :)

Answer 2

Answer: option A

Explanation: since as we know that notation to write electronic configuration is nl^x

Here n represents the main shell number and l tells about subshell and X denotes the no of Electrons present in that subshell.

In our case , n=3 ,that means it t main third shell. Or we can say it as shell 'M'