TEST YOURSELF 2.1 Chemistry 9th Chapter 2

TEST YOURSELF 2.1

(1) Do you know any element having no neutrons in its atom?

Hydrogen atom has no neutron but in its isotopes like deuterium and tritium, it has one and two neutrons respectively.

(2) Who discovered an electron, a proton and a neutron?

J.J Thomson discovered an electron.

Goldstein discovered a proton.

Chadwick discovered a neutron.

(3) How does electron differ from a neutron?

Sr.No	Electron	Neutron
1	Electron has negative charge.	Neutron has no charge.
2	Electron is light in weight as compared to neutron.	Neutron is Heavier in weight as compared to electron.
3	Electron is present outside the nucleus.	Neutron is present inside the nucleus.
4	Electron is deflected towards positive plate in an electric field.	Neutron does not deflect in electric field.

(4) Explain how anode rays are formed from the gas present in the discharge tube?

Anode rays are produced when electrons or cathode rays collide with the residual gas molecules present in discharge tube and ionize them as follows:

M + e^-    =        M⁺ +2e^-

Where M is any gas.