How do you find out the number of electrons in an atom using the periodic table?

Question

I'm trying to figure this out.
I know that the atomic number is the number of protons, and I know that the atomic mass minus the atomic number is the number of neutrons.
I know that you get the electrons by doing something with the ion charges and the atomic number, but I don't remember what it is. I'm confused. Heeeeeeeelp!!!

Answer 1

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Answer 2

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RE:
How do you find out the number of electrons in an atom using the periodic table?
I'm trying to figure this out.
I know that the atomic number is the number of protons, and I know that the atomic mass minus the atomic number is the number of neutrons.
I know that you get the electrons by doing something with the ion charges and the atomic number, but I don't remember...

Answer 3

The number of electrons is always the same as the number of protons in an atom -- the electrons and protons have to balance out. So if you know the atomic number, then you know the number of protons, and so you know the number of electrons. The atomic number IS the numer of electrons as well as protons.

Answer 4

Unless it is an ion, # of protons = # of electrons. This is because the proton and electron count need to balance out, as positive charges are attracted to negative charges.

Answer 5

the number of electrons = the number of protons

but if the element has a + charge then subtract the number on the cahrge with the number of protons and that give you the number of electrons, but if there is a - charge then add the number on the charge to the number of protons and that gives you the number of electrons

Answer 6

the # of electrons is = to the # of protons, unless it is an ion. if it has a (+) charge, then subtract 1from the atomic #, if it has a (-) charge, then add 1 to the atomic #