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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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Answers by country

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
answers
flagthe Netherlands
0%
14%
80%
4%
21
flagMalaysia
20%
0%
80%
0%
10
flagAustralia
14%
7%
71%
7%
42
flagPakistan
9%
3%
71%
15%
32
flagNigeria
4%
6%
68%
20%
50
flagGreece
7%
7%
64%
21%
14
flagIndia
9%
13%
58%
16%
302
flagthe United States
13%
13%
58%
13%
167
flagthe United Kingdom
20%
6%
58%
13%
82
flagGermany
10%
14%
55%
16%
188
flagAustria
20%
14%
52%
8%
34
flagPoland
14%
16%
50%
17%
2707
flagthe Philippines
30%
11%
38%
19%
26

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