Which of the following places the elements in the correct order of increasing first ionization energy?
a. p, s, cl
b. f, o,n
c. cl, s, p
d. be, mg, ca

Answer : The correct option is A.

Explanation :

Ionization energy : It is defined as the less amount of energy is required to remove the electron from their valence shell.

In general,

As we go down in a periodic table, the ionization energy decreases and as we across a period in a periodic table, the ionization energy increases.

In Case of P, S, Cl, the ionization energy increases as we are moving from left to right.

In Case of F, O, N, the ionization energy decreases as we are moving from right to left.

In Case of Cl, S, P, the ionization energy decreases as we are moving from right to left.

In Case of Be, Mg, Ca, the ionization energy decreases as we are moving from top to bottom.

Therefore, the correct answer is A.

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explanation: