What is the atomic number of a chemical element?

The number of neutrons in the atom's nucleus
The number of atoms
The number of protons in the atomic nucleus
The number of electrons in the atomic nucleus
The atomic number or proton number of a chemical element is the number of protons found in the nucleus of an atom. It is identical to the charge number of the nucleus. The atomic number uniquely identifies a chemical element.
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The number of neutrons in the atom's nucleus
The number of atoms
The number of protons in the atomic nucleus
The number of electrons in the atomic nucleus
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flagNigeria
0%
5%
82%
5%
17
flagthe Netherlands
0%
11%
82%
5%
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flagAustralia
12%
6%
70%
9%
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flagGreece
7%
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69%
23%
13
flagPakistan
12%
4%
66%
16%
24
flagIndia
7%
14%
61%
15%
250
flagthe United States
11%
14%
59%
13%
133
flagthe United Kingdom
21%
7%
56%
14%
55
flagGermany
12%
14%
53%
18%
88
flagPoland
14%
17%
50%
17%
1981
flagthe Philippines
33%
0%
50%
16%
18
flagAustria
23%
15%
46%
7%
13