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February 27, 2015

February 27, 2015

Posted by **Alex** on Thursday, February 9, 2012 at 4:59pm.

A. 40Ar B. 24Mg2+ C. 34S2− D. 19F− E. 16O2−

How do I determine the numbers of protons, neutrons, and electrons of each?

- chemistry -
**DrBob222**, Thursday, February 9, 2012 at 5:03pm#protons = atomic number from the periodic table.

# electrons = # protons.

# p + #n = mass number

For 40Ar, atomic number is 18.

#p = 18, #e = 18

#p + #neutrons = 40

# neutrons = 40-18 = 22

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