The 1^st , 2^nd and the 3^rd ionization enthalpies I₁, I₂ and I₃, of four atoms with atomic numbers n, n+1,
n+2 and n+3 , where n < 10, are tabulated below. Find correct statement(s)
Atomic number Ionization Enthalpy (kJ/mol)
I₁ I₂ I₃
n 1681 3374 6050
n + 1 2081 3952 6122
n + 2 496 4562 6910
n + 3 738 1451 7733

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Atomic number n+3 is highly electropositive

For the atomic number n+1, we can say that it has stable electronic configuration.

The value of n is 9.

The element with atomic number n belongs to p-Block

answer is A, B, C, D.

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Detailed Solution

Atomic number	Ionization Enthalpy (kJ/mol)
Atomic number	I₁	I₂	I₃
n	1681	3374	6050
n + 1	2081	3952	6122
n + 2	496	4562	6910
n + 3	738	1451	7733

By observing the values of I₁, I₂ & I₃ for atomic number (n+2), it is observed that I2 >>I1.
This indicates that number of valence shell electrons is 1 and atomic number (n+2) should be an
alkali metal.
Also for atomic number (n+3), I₃ >> I₂.
This indicates that it will be an alkaline earth metal which suggests that atomic number (n+1)
should be a noble gas & atomic number (n) should belong to Halogen family. Since n < 10; hence
n = 9 (F atom)
Note : n = 1 (H atom) cannot be the answer because it does not have I₂ & I₃ values.