Chemical symbol represents

Chloride ion has number of protons

A. 17

B. 18

C. 24

D. 34

Smaller particles in an atom are called

A. atomic particles

B. subatomic particles

C. smaller particles

D. neutral particles

The number of protons in a 'carbon' atom is

A. 6

B. 11

C. 12

D. 10

A modern model of an atom shows that electrons are present outside nucleus in the region of high

A. probability

B. velocity

C. speed

D. energy level

"O3" is a chemical formula of

A. oxygen

B. oxides

C. ozone

D. acid rain