Structure of the atom Worksheet-1
A. The rays consist of negatively charged particles
B. The rays consist of positively charged particles
C. The rays consist of neutral particles
A. Yes, they originate from anode
B. No, they originate from the gas filled in the discharge tube
C. They can be originated either from anode or cathode
A. Electron B. Proton C. Neutron
A. J. J. Thomson
B. E. Goldstein
C. James Chadwick
A. Yes B. No
C. Depends on the type of element
A. Radium B. Polonium C. Thorium D. Plutonium
A. No, they are similar to helium nucleus and not helium atoms
B. Yes, they are similar to helium atoms
C. No, they are similar to hydrogen atoms and not helium atoms
A. Silver B. Gold C. Platinum D. Copper
A. Ferrous sulphide B. Sodium sulphide
C. Potassium sulphide D. Zinc sulphide
Explanation: Mass of electron is 0.000548597 a.m.u. or 9.1 x 10-31 kg.
Mass of proton is 1.0072766 a.m.u. or 1.6726 x 10-27 kg.
Mass of neutron is 1.0086654 a.m.u. or 1.6749 x 10-27 kg.
Neutron is heaviest among all the sub atomic particles.
Explanation: E. Goldstein discovered the anode rays. He called these rays canal rays
Explanation: No, air is a poor conductor of electricity
Explanation: An atom is neutral. Number of protons in an atom is equal to number of electrons.
Explanation: Radium (Ra)
Explanation: An alpha particle is a particle made up of two protons and two neutrons. Since this configuration is similar to that of a helium nucleus, it is often referred to as a helium nucleus
Explanation: Zinc sulphide