Beaconhouse School System
Frontier Campus Boys
Topic: Number of Electron, Proton and Neutron
Oxygen
Carbon
8
16O
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12C
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Nitrogen
Helium
7
14O
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4He
2
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Hydrogen
1H
Calcium
1
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20Ca
10
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Sodium
23Na
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6
Chlorine
11
35Cl
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17