how do you determine the number of subatomic particles in an atom using the periodic table?

Question

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Answer 1

In a neutral atom, the number of Electrons = number of protons = to the atomic number. The number of neutrons is equal to the atomic mass - the atomic number.
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Answer 2

Find the atom, in the Periodic Table and note the Atomic Number. For example, cobalt, Co, has At. No. 27. This means that there are 27 protons in the nucleus andv27 electrons outside the nucleus in the neutral atom. (There are fewer electrons in cobalt ions.) Next, the atomic weight is 59: 59 - 27 = 32, so there are 32 neutrons in the Co nucleus.

Sometimes the number of neutrons is unclear. For example, chlorine, Cl, has At. No. 17 and At. Wt. 35.457. Neutral chlorine atoms have 17 protons in the nucleus. But about 1/4 of the atoms have 20 neutrons for an atomic mass number of 37, while about 3/4 of them have 18 neutrons for an atomic mass number of 35. The two isotopes with the two different mass numbers average out to 35.457.

Answer 3

Mass number + atomic number

Answer 4

atomic number = # of protons / electons (assuming its not an ion. if it is a negitve charge add the number given to the atomic number and substract if it is a positive ion)

atomic mass - atomic number = average # of neutrons

Answer 5

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