Pick out the correct statement?

A. Loss of electrons from neutral atoms produces negative ions
B. The radius of nucleus & atomic size are of the order of 10-12 cm & 10-8 cm respectively
C. Gain of electrons by neutral atoms form cations
D. Proton to neutron ratio in a stable nucleus is 2 : 1

Plutonium________________?

A. Is recovered from spent fuel from thermal nuclear reactor
B. Has much lower melting point (640°C ) compared to thorium (1690°C)
C. Both A. and B.
D. Neither A. nor B.

Pick out the wrong statement?

A. The nucleus of a hydrogen atom is identical with a proton
B. A, β-ray particle is identical with an electron
C. Mass of an electron is about 1/1800th of the lightest nucleus
D. Positron is heavier than a proton

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