The first (IE1) and second (IE2) ionization energies (kJ/mol) of a few elements designated by Roman numerals are given below. Which of these would be an alkali metal? IE1 IE2 (a) I 2372 5251 (b) II 520 7300 (c) III 900 1760 (d) IV 1680 3380

Question

The first (IE1) and second (IE2) ionization energies (kJ/mol) of a few elements designated by Roman numerals are given below. Which of these would be an alkali metal? IE1 IE2 (a) I 2372 5251 (b) II 520 7300 (c) III 900 1760 (d) IV 1680 3380 (A) a (B) b (C) c (D) d

Tardigrade Admin · Accepted Answer

As alkali metals have the lowest IE1 values in their respective periods and also there is a large jump between IE1 and IE2 due to the removal of second electron from the noble gas core, therefore, out of the given IE1 and IE2 values, (II) belongs to alkali metals.

Q. The first $(I E_{1})$ and second $(I E_{2})$ ionization energies (kJ/mol) of a few elements designated by Roman numerals are given below. Which of these would be an alkali metal?

$I E_{1}$ $I E_{2}$

(a) $I$ 2372 5251

(b) $II$ 520 7300

(c) $III$ 900 1760

(d) $I V$ 1680 3380

a

b

c

d

As alkali metals have the lowest $I E_{1}$ values in their respective periods and also there is a large jump between $I E_{1}$ and $I E_{2}$ due to the removal of second electron from the noble gas core, therefore, out of the given $I E_{1}$ and $I E_{2}$ values, $(II)$ belongs to alkali metals.

Q. The first (IE1​) and second (IE2​) ionization energies (kJ/mol) of a few elements designated by Roman numerals are given below. Which of these would be an alkali metal? IE1​ IE2​ (a) I 2372 5251 (b) II 520 7300 (c) III 900 1760 (d) IV 1680 3380

a

b

c

d

As alkali metals have the lowest IE1​ values in their respective periods and also there is a large jump between IE1​ and IE2​ due to the removal of second electron from the noble gas core, therefore, out of the given IE1​ and IE2​ values, (II) belongs to alkali metals.

Q. The first $(I E_{1})$ and second $(I E_{2})$ ionization energies (kJ/mol) of a few elements designated by Roman numerals are given below. Which of these would be an alkali metal?

$I E_{1}$ $I E_{2}$

(a) $I$ 2372 5251

(b) $II$ 520 7300

(c) $III$ 900 1760

(d) $I V$ 1680 3380

As alkali metals have the lowest $I E_{1}$ values in their respective periods and also there is a large jump between $I E_{1}$ and $I E_{2}$ due to the removal of second electron from the noble gas core, therefore, out of the given $I E_{1}$ and $I E_{2}$ values, $(II)$ belongs to alkali metals.