Answer:
17)c: the reactivity of a metal.
Explanation:
Protons: 7
electrons: 7
neutrons: 7
Answer:
I guess 4 weeks is a little late.
Explanation:
The mass number is the number of protons plus the number of neutrons. Since there are 16 neutrons, there are 14 protons. This also corresponds to the atomic number, so this atom's atomic number is 14 which is also Silicon
