List of top Chemistry Questions on Atomic Structure

Which among the following is the lightest particle :
How many electrons, protons and neutrons are present in Y\(^+\), if atomic number of Y is 19 and mass number of Y is 39 :
The correct set of quantum numbers for an element (Z=17) for the unpaired electron will be
A neutral atom (Atomic number > 1) consists of:
0.0025 has _________ significant figure
Which of the following groups contains only atoms that are paramagnetic in their ground state?
Calculate the energy in joule corresponding to light of wavelength 45 nm:
(Planck’s constant h = 6.63 × 10-34 Js; speed of light c = 3 × 108 ms-1)
\(Be^{2+}\) is isoelectronic with which of the following ions?
What is the maximum number of orbitals that can be identified with the following quantum number?
n = 3, l = 1, ml = 0
What is the molar mass of \( \text{Na}_2\text{CO}_3 \)?
The element having \([Ar]3d^{10}4s^1\) electronic configuration is