JEE Advanced 2020Paper 2

Exam: JEE Advanced
Year: 2020
Paper: Paper 2
Subject: Chemistry
Chapter: Classification of Elements and Periodicity in Properties

JEE Advanced 2020 · Paper 2 · Chemistry · Classification of Elements and Periodicity in Properties

The 1 ^ st , 2 ^ nd and the 3 ^ rd ionization enthalpies, I _ 1 , I...

The ${1}^{st}$ , ${2}^{nd}$ and the ${3}^{rd}$ ionization enthalpies, ${I}_{1}, {I}_{2}$ and ${I}_{3}$ , of four atoms with atomic numbers $n, n + 1, n + 2,$ and $n + 3,$ where $n < 10,$ are tabulated below. What is the value of $n$ ?

Atomic number	Ionization Enthalpy (kJ/mol)
	${I}_{1}$	${I}_{2}$	${I}_{3}$
$n$	$1681$	$3374$	$6050$
$n + 1$	$2081$	$3952$	$6122$
$n + 2$	$496$	$4562$	$6910$
$n + 3$	$738$	$1451$	$7733$

Correct answer

Step-by-step solution

From given data $( n + 2 )$ atom is alkali metal which is sodium.

As $n + 2 = 11$

So, $n = 9$

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