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Which particle has the least mass?

June 2018 NY Regents Chemistry Exam

28 Which particle has the least mass?

(1) alpha particle

(2) beta particle (3) neutron

(4) proton

Solution: Table O on the Reference Table lists nuclear particles and their symbols. The mass number is on the top left corner of each symbol. Alpha particle has a mass of 4. Beta particle has a mass of 0. Neutron has a mass of 1 and proton has a mass of 1.

Answer: 2

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