# What are the number of protons, neutrons, and electrons in (16,8) O and (40, 18) Ar ?What are their atomic number and mass number?

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What are the number of protons, neutrons, and electrons in $_8^{16}O$and $_{18}^{40}O$ ? What are their atomic number and mass number?

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Any element can be represented with its atomic number, symbol and its atomic mass using a simple representation. Any element ‘X’ having the atomic number ‘A’ and atomic mass ‘M’ can be represented as $_{M}^{A}X$

For 168O:

No. of protons = 8

No. of electrons = 8

No. of neutrons = (16 – 8) = 8 (atomic mass minus the protons is neutrons)

Atomic no. = 8 Mass no. = 16

For 1840Ar:

No. of protons = 18

No. of electrons = 18

No. of neutrons = (40 – 18) = 22

Atomic no. = 18

Mass no. = 40

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