Atomic mass protons column electrons atomic number neutrons row 11 12 23

1 answer:

3 0

A) Mass Number B) Protons and Electrons C) (I think group but I'm not 100% sure on this...) D) 12 (To work out the number of neutrons you do MASS number - ATOMIC number aka the number of protons so in this case you'd do 23-11=12) Hope this helps

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