Question

Q3) Define the following:
a) ion
b) atomic mass number

Answer 1

Answer:

) Atom: The smallest part into which an element can be divided.

(2) Isotope: Species having same atomic number but different mass number.

(3) Atomic number: Number of electrons present in an atom which is equal to number of protons in a neutral atom.

(4) Atomic mass number: Sum of the number of protons and neutrons i.e, nucleons present in an atom.

(5) Moderator in nuclear reactor: A material that slows the speed of neutrons.

Answer 2

Ion :- The charge of an atom is called ion.

Atomic mass number :- The sum of protons and neutrons of a single atom is called atomic mass.