MolSynapsequestion bank

MolSynapse / Question bank / Periodic Table and Periodicity / Modern periodic table and classification of elements

JEE Main levelSingle correct optionDifficulty 2 of 3pt018

The ion $X X^{2 +}$ has the ground-state configuration $[Ar] 3 d^{5}$ . The element X belongs to

Agroup 5, period 4
Bgroup 7, period 3
Cgroup 9, period 4
Dgroup 7, period 4

Answer: D

The ion has

18 + 5 = 23

electrons, so X has 25 electrons (Z = 25), configuration

[Ar] 3 d^{5} 4 s^{2}

. Period 4 and group

= 5 + 2 = 7

(manganese).

Practice Periodic Table and Periodicity More on Modern periodic table and classification of elements

Previous questionNext question

More questions on Modern periodic table and classification of elements

Element 119, if it is ever made, is expected to be placed in JEE Main level
The ion M^3+ is isoelectronic with argon. The element M lies in JEE Main level
Which one of the following sets consists entirely of d-block elements? JEE Main level
Which of the following atomic numbers correspond to p-block elements? JEE Main level
Which pair of atomic numbers belongs to the same group of the long form of the periodic table? JEE Main level
Select the correct statement(s) about periodic trends. JEE Advanced level