Question

What is the mass number, atomic number, total number of neutrons, total number of protons, the ${}_9{}^{}\mathrm{F}$ total number of electrons, and make electronic configuration of the following

${}_9{}^{}\mathrm{F}$¹⁹

Answer 1

Mass number — total mass of nucleons is considered as the mass number of the atom

• mass number = mass of protons + mass of neutrons

Atomic number — total number of electrons or total number of protons is known as its atomic number

• Atomic number = total number of electrons or total number of protons

Neutron — it is chargeless sub-atomic particles

• it is denoted by n and present in the nucleus
• total number of neutrons [n] = Mass number[ A] – Atomic number [ Z ]

Protons — it is +ve charge of the atom

• present in the nucleus
• total number of protons = atomic number of its element

Electron – it is a -ve charge of the atom

• it is revolving around the nucleus in the orbit
• total number of the electron = Atomic number of its element

Electronic configuration — The distribution of an electron in the shell or orbit is known as electronic configuration

• it also helps to predict whether the element is a metal,non-metal, metalloid and noble gas
• Electronic configuration of the fluorine atom is as follows
• ${}_9{}^{}\mathrm{F}$¹⁹ = 2,7

Thus, the mass number is 19, the atomic number is 9, the total number of neutrons is 10, the total number of a proton is 9, the total number of electrons is 9, and the electronic configuration is 2,7