# chemistry

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Which of the following isotopes possesses a greater number of electrons than it does neutrons?
A. 40Ar B. 24Mg2+ C. 34S2− D. 19F− E. 16O2−

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

• chemistry -

#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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