Which one of the following statements is not correct ?
Elements are defined by the number of protons they possess.
Isobars are atoms having the same atomic number but different mass number.
The mass number of an atom is equal to the number of nucleons in its nucleus.
Valency is the combining capacity of an atom.
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC CDS-2 – 2019
– Isobars are atoms of different elements that have the same mass number but different atomic numbers.
– Isotopes are atoms of the same element that have the same atomic number but different mass numbers.
– The mass number is the total number of protons and neutrons (nucleons) in an atom’s nucleus.
– Valency refers to the combining capacity of an atom, determining how it forms chemical bonds.