Question

Given the element aluminium with atomic number 13 and number of neutrons 14.Find the mass number, number of protons, number of electrons and electronic configuration.

Answer 1

• The element aluminum (Al) is a group 13 element. The atomic number, which is equal to the number of protons in an atom is given as 13. Hence the number of protons = 13.
• In a neutral atom, the number of electrons will be equal to the number of protons. Hence the number of electrons = 13.
• Electronic configuration, also called electronic structure, is the arrangement of electrons in energy levels around an atomic nucleus
• Hence the electronic configuration is 2,8,3.
• The mass number is the sum of the number of protons and neutrons.
• Given the number of protons = 13, the number of neutrons = 14.
• Hence mass number = (13+14) = 27.