Question

The maximum number of electrons that can be accomodated in the M-shell of an atom is.

• A. $25$
• B. $10$
• C. $18$
• D. $8$

Answer 1

The correct option is C $18$

The maximum number of electrons in an orbit is given by $2n^2$.

According to Niels Bohr, the shells or orbits in which electrons are present in an atom are represented by K (n=1), L (n=2), M (n=3), N (n=4). The term, 'n' represents the orbit's number. So, M shell will have $2$x$3^2$= $2$ x $9$= $18$ electrons