Chemistry 9 Unit 2

Which of the following particles were used by Rutherford in his experiment?

• $\alpha-particles$

• $\beta-particles$

• $\gamma-rays$

• electrons

The few  $\alpha-particles$  deflected in Rutherford experiment were due to:

• electrostatic repulsion

• electrostatic attraction

• gravitational force

• electromagnetic force

From his experiment, Rutherford proposed which model for an atom?

• Planetary Model

• Plum Pudding Model

• Billiard Ball Model

The mass of an atom is concentrated in ______________.

• Nucleus

• Electrons

• Protons

• Shells

Which spectrum is obtained for an atom?

• Continuous spectrum

• Line spectrum

The charge on NUCLEUS is ____________.

• Positive

• Negative

• No charge

According to Bohr, ORBIT was also called ______________.

• Sub-shell

• Energy Level

• Quark

When an electron is present in a particular orbit, it ______________.

• radiates energy

• does not radiate energy

When an electron jumps to higher orbit, it ________________ energy.

• absorbs

• releases

Following model is called :

• Bohr's Model

• Rutherford Model

• Chadwick Model