1.Name the three sub-atomic of an atom .
2.Helium atom has an atomic mass of 4u and two protons in its nucleus . how many neutrons does it have?
Answers
Answered by
1
Answer:
1. Electron, Porton and Neutron
2. Atomic mass=Proton no. + neutron no.
4=2+neutron no.
neutron no. =2
Hence helium(He) has two neutrons.
Answered by
0
Answer:
electron, neutron, proton
Explanation:
no of proton +No of neutron = mass number
2+2= 4
no of neutron = mass no - no of proton
no of neutron = 4 - 2 = 2
no of neutron is 2
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