A) the number of electrons increases successively
B) the number of neutrons increases successively
C) the number protons increases successively
D) electrons being filled in orbitals with same principal quantum number repel each-other
Correct Answer: D
Solution :
: When we go from left to right in a period, the nuclear charge increases by one unit at each element and added electrons enter into the same shell. Since, the electrons in the same shell do not shield each other from the nucleus effectively, hence the atomic size decreases, due to combined effect of the increased nuclear charge and decrease of atomic size, the ionisation energy increases in going from left to right in period.
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