atomic structure I

Who is credited for developing the nuclear model of atom?

• Dalton

• Thompson

• Rutherford

• Bohr

What chemical species is called alpha particles?

• H2

• He++

• H

• He+

When alpha particles are passed through thin gold foil, most of them go straight through because of

• the empty space present in the atoms.

   

• negative charge

• dense positive charge

• high speed

After the gold foil experiment, Rutherford concluded that the size of the nucleus is very small compared to the size of an atom. The is because

• About 1 out of 10000 alpha particles bounced back after hitting the gold foil.

• Very few alpha particles passed through the gold foil.

• Most of the alpha particles deflected back after hitting the gold foil.

• A few alpha particles deflected with a small angle.

Rutherfords alpha particles scattering experiment resulted in discovery of

• electrons

• protons

• neutrons

• nucleus

According to Rutherford's nuclear model of atom, the electrons in an atom are

• stationary

• circular

• centralized

• moving

Bohr's model could successfully explain

• the spectrum of hydrogen only

• the spectrum of species containing only one electron

• the spectrum of multi-electron atoms

• the spectrum of hydrogen molecules

Concept of quantization of energy was introduced by

• Bohr

• Rutherford

• Heisenberg

• de Broglie

The region of hydrogen spectrum where Paschen series lie is

• Ultraviolet

• Visible

• Infra red

• Far infrared

It is impossible to determine the position as well as momentum of an electron in an atom. This principle is known as

• de Broglie equation

• Pauli's exclusion principle

• Aufbau Principle

• Heisenberg's uncertainty principle