Question

Question 17:
Correct orders of Ist I.P. are -
(i) Li < B < Be <c
(ii) O <N<F
(iii) Be <N< Ne​

Answer 1

Answer:

ii)O <B < Be <c

Explanation:

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Answer 2

☆Theory :

Ionisation potential :

The energy required to remove the most losely electron from the outermost orbit of isolated gaseous atom of an element is called ionization potential.

Factors affect

1)No of shells : with increase in number of shells the atomic radius decreases hence ionization potential decreases.

2)Effecting charge

3) Shielding effect

4) Stability of half filled and fully filled orbitals

5) Penetration power

Periodic trends in ionisation potential

• In a period : the value of ionization potential normally increases on going from left to right in a period , Because effective nuclear charge increases and atomic size decreases.

Answer :

Li <B < Be < C< O < N < F < Ne

Explanation of answer :

in second period Ionisation of Be greater than of B .In the third period ionisation potential of mg is greater than Al, due to stability of full filled orbitals. Ionization Potential of nitrogen is greater than oxygen .