Define the terms : 

i. Isotones 

ii. Isoelectronic species 

iii. Electronic configuration

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1 Answers

i. Isotones : 

Isotones are defined as the atoms of different elements having same number of neutrons in their nuclei. 

e.g. \(^{11}_5B\) and \(^{12}_{6}C\) having 6 neutrons each are isotones.

ii. Isoelectronic species : 

Isoelectronic species are defined as atoms and ions having the same number of electrons. 

e.g. Ar, Ca2+ and K+ containing 18 electrons each.

iii. Electronic configuration :

Electronic configuration of an atom is defined as the distribution of its electrons in orbitals.

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