Answer:
1. Beryllium, atomic no. 4 , no. of protons 4 , mass 9.012182 u
2. sodium , 11 , 11 , 22.989769 u
3. oxygen , 8 , 8 , 15,999
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Answer:
1. Beryllium, atomic no. 4 , no. of protons 4 , mass 9.012182 u
2. sodium , 11 , 11 , 22.989769 u
3. oxygen , 8 , 8 , 15,999