What is the atomic number and mass number of A3+ ion with 21 electrons and 25 neutrons?
Number of protons = 21 + 3 = 24
Atomic number = 24
Mass number = No. of protons + No. of neutrons
= 24 + 25 = 49.
Define isotopes, isobars and isotones.
Isotopes: Isotopes are atoms of the same element having same atomic number but different mass numbers. e.g.
Isobars: Isobars are atoms of different elements having different atomic numbers but the same mass number. e.g. are isobars of each other.
Isotones: Isotones are atoms of different elements having same number of neutrons. For example
Here number of protons = 13
Number of electrons = 13
Atomic number = Number of protons = 13
Number of neutrons = Mass No. (A) - At. No. (Z) = 27- 13= 14
Name different isotopes of hydrogen. Give their atomic numbers and mass numbers.