1. Species with same number of neutrons but different number of protons are called: a) Isotones b) Isotopes c) Isomers d) Isobars AnswerAnswer: a [Reason:] Isotones are atoms of different elements having same number of neutrons but different atomic and mass numbers. For e.g., Boron-12 and Carbon-12 are isotones each having 7 neutrons. 2. Atomic…