Question

Find the number of protons and electrons of N-3.

Would it be 7protons, and 4electrons?
or 7 protons, and 7electrons?????

Answer 1

neutral Nitrogen has an atomic number of 7 (from periodic table) thus it has 7 protons and 7 electrons (equal +p and -e).
Since it is an ion with charge -3, it means that it gained 3 electrons. therefore, N^-3 has 7 protons and 10 electrons.

hope this helps~ :)

Answer 2

thank you!