Radius of an electron in 1s is _____ than 2s

• Higher

• Equal

• Lower

• 2s does not exist

Number of electrons and orbitals in a subshell can be determined by

• n², 2n

• n, 2n

• 2(2l+1), 2l+1

• 2s does not exist

The highest energy electron of an element in the ground state is characterized by the following quantum numbers n = 3, l = 0 , m = 0 , s = + ½ identify the element

• Al

• Na

• P

• N

Which of the following have same number of unpaired electron as in Mn²⁺

• Mn⁺⁴

• Fe⁺³

• Fe⁺²

• Cu⁺¹

The element whose electronic configuration is 1s², 2s², 2p⁶, 3s², 3p³ belongs to ______period and ____ group of periodic table

• 3^rd , IIA

• 3^rd , VA

• 2^nd , IIA

• 3^rd , VIA

If the last electron is filled in 3d subshell. The next coming electron will move into

• 4s

• 4p

• 4d

• 4f

The last electron in the Na and K can be distinguished by

• Principal quantum number

• Azimuthal quantum number

• Magnetic quantum number

• Spin quantum number

Without applying Hund’s rule the electronic configuration of one of the following cannot be justified

• Fluorine

• Neon

• Sodium

• Phosphorous

The positive rays have maximum e/m value when one of the following gas is used in discharge tube

• O₂

• N₂

• F₂

• Cl₂

Electronic configuration is the distribution of electrons in

• Sub-shells in their decreasing energy order

• Shells in their decreasing energy order

• Outermost shells only

• Shells and sub shells with increasing energy order