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2 Which particle has a mass of approximately 1 atomic mass unit?(1) an alpha particle (3) an electron

(2) a beta particle (4) a neutron

2 Answers

3 votes
A neutron has a mass of approximately 1 atomic mass unit. 
User Irmantas
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4 votes
A neutron has a mass of about 1 atomic unit / number.
User Curtis White
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