Symbols (not real) of some atoms are given, P 8 17 , Q 18 40 , P 8 16 , R 20 40 Find The atomic number and mass number of these elements.

The atomic number is the fundamental properties of an atom. The atomic number is denoted by 'z'. The atomic number is equal to the number of protons present in an atom. The mass number of an atom is defined as the sum of the number of protons and the number of neutrons. It is denoted by 'A'. In isotopes, it is represented as X Z A . Atoms Atomic Number Mass Number P 8 17 8 17 Q 18 40 18 40 P 8 16 8 16 R 20 40 20 40

Symbols (not real) of some atoms are given, P 8 17 , Q 18 40 , P 8 16 , R 20 40 Which among these are isotopic pairs?

Isotopes are atoms with the same number of protons but that have a different number of neutrons. The atomic number is equal to the number of protons and the atomic mass is the sum of protons and neutrons, isotopes are elements with the same atomic number but different mass numbers. P 8 17 , Q 18 40 , P 8 16 , R 20 40 In these atoms, atom P 8 17 and P 8 16 are having the same atomic number 8 , but different mass numbers 17 , 16 respectively. So these are the isotopes of each other.

Symbols (not real) of some atoms are given, P 8 17 , Q 18 40 , P 8 16 , R 20 40 Draw the Bohr model of atom Q.

The atom Q 18 40 is having an atomic number 18 . According to this, the electronic configuration is 2 , 8 , 8 . Hence, Bohr model of atom is as follows: