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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
flagSwitzerland
9%
0%
90%
0%
11
flagMalaysia
20%
0%
80%
0%
10
flagthe Netherlands
0%
13%
77%
9%
22
flagAustralia
14%
7%
71%
7%
42
flagPakistan
9%
3%
71%
15%
32
flagNigeria
4%
6%
68%
20%
50
flagthe United States
11%
11%
64%
11%
195
flagGreece
7%
7%
64%
21%
14
flagIndia
9%
13%
58%
16%
302
flagthe United Kingdom
21%
5%
57%
13%
88
flagAustria
22%
13%
52%
8%
36
flagPoland
14%
16%
50%
17%
2811
flagGermany
18%
12%
50%
15%
217
flagthe Philippines
30%
11%
38%
19%
26

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