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JEE Main 202118 MarchEvening Shift

Exam: JEE Main
Year: 2021
Date: 18 March
Shift: Evening Shift
Subject: Chemistry
Chapter: Classification of Elements and Periodicity in Properties

JEE Main 2021 · 18 March · Evening Shift · Chemistry · Classification of Elements and Periodicity in Properties

The first ionization energy of magnesium is smaller, as compared to...

The first ionization energy of magnesium is smaller, as compared to that of elements

X

and

Y

, but higher than that of

Z

. The elements

X, Y

and

Z

, respectively, are :

Options

Achlorine, lithium and sodium
Bargon, lithium and sodium
Cargon, chlorine and sodium
Dneon, sodium and chlorine

Correct answer

C. argon, chlorine and sodium

Step-by-step solution

The ${1}^{st}$ IE order of ${3}^{rd}$ period is

$Na < Al < Mg < Si < S < P < Cl < Ar$

$X \text{ and } Y$ are $Ar \text{ and } Cl$

$Z$ is sodium $( Na )$ .

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