Question

An element has five electrons in the M-shell. The atomic number of the element is 15.

• A. True
• B. False

Answer 1

The correct option is A True

• The electronic configuration of an element with atomic number 15 is 2,8,5.
• The shells that represent the configuration are K,L,M.
• K shells contains 2 electrons, L shell contains 8 electrons and M shell contains 5 electrons.

Thus, the given statement is true i.e. an element has five electrons in the M-shell. The atomic number of the element is 15.