structure of atom class xi

Rutherford’s alpha-particle experiment was responsible for discovery of

• Nucleus

• Electron

• Proton

• Neutron

According to 2n 2 rule 32 electrons can be assigned to which shell-

• K

• M

• L

• N

If K and L shells of an atom are full, then what would be the number of electrons in the atom?

• 18

• 2

• 8

• 10

Mg2+ is isoelectronic with

• Ca2+

• Na+

• Zn2+

• Cu2+

Which of the following statements about the electron is incorrect?

• It is a negatively charged particle.

• The mass of electron is equal to the mass of neutron.

• It is a basic constituent of all atoms.

• It is a constituent of cathode rays.

In E = hυ, h is

• Rydberg's constant

• Einstein;s constant

• Plank's constant

• Thomson's constant