Structure of Atom MCQs

Everything around us is composed of atoms, which are the smallest units of matter possessing all its chemical properties. An atom consists of a positively charged nucleus containing protons, which are positively charged, and neutrons, which are neutral. This nucleus is encircled by negatively charged electrons. In a neutral atom, the number of protons equals the number of electrons. An element’s atomic number is directly linked to its chemical and physical properties.

Orbital angular momentum of p electrons is

A gas X has Cp and Cv ratio as 1.4, at NTP 11.2 L of gas X will contain_______ number of atoms

(a) 1.2 × 10²³
(b) 3.01 × 10²³
(c) 2.01 × 10²³
(d) 6.02 × 10²³

How many orbitals can have the following set of quantum numbers, n = 3, l = 1, m1 = 0?

(a) 3
(b) 1
(c) 4
(d) 2

3p orbital has _ radial nodes

(a) three
(b) two
(c) one
(d) none

A 0.66 kg ball is moving with a speed of 100 m/s. Find its wavelength

(a) 6.6 × 10^-34 m
(b) 6.6 × 10^-32 m
(c) 1.0 × 10^-32 m
(c) 1.0 × 10^-32 m

Electronic configuration of the outer shell of the element Gd with atomic number 64 is

(a) 4f⁴ 5d⁵ 6s¹
(b) 4f³ 5d⁵ 6s²
(c) 4f⁵ 5d⁴ 6s¹
(d) 4f⁷ 5d¹ 6s²

The excitation energy of a hydrogen atom from its ground state to its third excited state is

(a) 12.75 eV
(b) 0.85 eV
(c) 10.2 eV
(d) 12.1 eV

The orientation of atomic orbitals depends on their

(a) spin quantum number
(b) magnetic quantum number
(c) azimuthal quantum number
(d) principal quantum number

Number of unpaired electrons in N2+

(a) 3
(b) 1
(c) 2
(d) 0

Maximum number of electrons in a subshell can be

(a) 4l + 2
(b) 4l – 2
(c) 2n2
(d) 2l + 1