Question

An alom of an element has one electron in the
valence shell, and the inner shall have electrons.
each find the atomic no. of the element.​

Answer 1

Answer:

Valence shell has 1 electron and 2 inner shells have 8 electrons, thus the valence electron is in 'N' shell.

The electronic configuration is 2, 8, 8, 1 and atomic number is 19.