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A. volume of particles
B. number of particles
C. mass of particles
D. All of the above

A. Uni-negative
B. Uni-positive
C. Di-negative
D. Di-positive

A. Same number of neutrons
B. Same mass number
C. Same physical properties
D. Same chemical properties

A. High energy electron beam
B. ? – particle
C. X-rays
D. All of the above

A. H+ H H-
B. Li+ Na+ K+
C. C1- Br- I
D. F- Ne Na+

A. 1.6 x 10-27 kg
B. 1.6 x 10-24 kg
C. 1.6 x 10-26 kg
D. 1.6 x 10-28 kg

A. Mass number
B. Atomic mass
C. Relative abundance
D. all of the above

A. NaCl
B. H2O
C. CCI4
D. It can be applied to all mentioned above