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.

Kevin Dooley wikipedia → Atomic number

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Answers by country

Switzerland

90%

the Netherlands

14%

80%

Malaysia

20%

80%

Australia

14%

71%

Pakistan

71%

15%

Nigeria

68%

20%

Greece

64%

21%

the United States

12%

61%

12%

180

the United Kingdom

20%

59%

13%

India

13%

58%

16%

302

Austria

22%

13%

52%

Germany

16%

13%

51%

15%

208

Poland

14%

16%

50%

17%

2767

the Philippines

30%

11%

38%

19%

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