An atom has an atomic number of 13 and a mass number of 27. How many electrons will it have in its valence shell?
(a) How many electrons are there in each atom of the element ?
(b) How are these electrons distributed in the various energy levels ?
An element has an atomic number of 13 and an atomic mass of 27. (a) How many electrons are there in each atom of the element? (b) How are these electrons distributed in the various energy levels?
An atom has an atomic number of 19 and a mass number of 39. How many electron ,protons and neutrons does it have?