basic chemistry question?

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2016-10-03 5:03 am

how to:

Deduce the number of protons, neutrons and electrons in the following species:

1,1,H

17,8,O

what am i meant to do here?

回答 (1)

戇戇居士

2016-10-03 5:10 am

✔ 最佳答案

In 1,1,H (where the first "1" is a superscript and the second "1" is a subscript) :
Atomic number = 1
Mass number = 1

Hence,
Number of protons = Atomic number = 1
Number of neutrons = Mass number - Atomic number = 1 - 1 = 0
Number of electrons = Number of protons = 1

====
In 17,8,O (where "17" is a superscript and "8" is a subscript) :
Atomic number = 8
Mass number = 17

Hence,
Number of protons = Atomic number = 8
Number of neutrons = Mass number - Atomic number = 17 - 8 = 9
Number of electrons = Number of protons = 8

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