Question

9. Define the terms :
(a) mass number (b) ion
(d) anion
(e) element
(c) cation
(f) orbit.
What is element? ​

Answer 1

Answer:

a) mass number

The mass number, also called atomic mass number or nucleon number, is the total number of protons and neutrons in an atomic nucleus.

(b) ion

An ion is a charged atom or molecule. It is charged because the number of electrons do not equal the number of protons in the atom or molecule.

(d) anion

Anions are atoms or radicals (groups of atoms), that have gained electrons.

(e) element

An element is a substance whose atoms all have the same number of protons: another way of saying this is that all of a particular element's atoms have the same atomic number.

(c) Cation

Cation, atom or group of atoms that bears a positive electric charge.

(f) orbit.

An “orbit” is the energy level that an electron resides in within an atom or molecule. ... Each of these orbitals can hold 2 electrons (spin opposed), and the most basic orbital the S orbital does indeed look like a shell.