Answer truthfully:))​

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

answer: i dont know the answer but this might

explanation:

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