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Chemical elements by atomic number quiz

Lowest atomic number first. Five items per round, three tries, unlimited rounds.

Chemical elements by atomic number

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Quick answer: lowest atomic number first, the order is Hydrogen → Helium → Carbon → Nitrogen → Oxygen → Neon → Sodium → Aluminium → Calcium → Iron → Copper → Silver → Tin → Platinum → Gold → Mercury → Lead → Uranium.

About this list

The atomic number is the count of protons in an atom's nucleus and sets an element's place on the periodic table. Hydrogen is 1; uranium, at 92, is the heaviest element found in meaningful amounts in nature.

Chemical elements by atomic number (lowest atomic number first)
#Itemprotons
1 Hydrogen 1
2 Helium 2
3 Carbon 6
4 Nitrogen 7
5 Oxygen 8
6 Neon 10
7 Sodium 11
8 Aluminium 13
9 Calcium 20
10 Iron 26
11 Copper 29
12 Silver 47
13 Tin 50
14 Platinum 78
15 Gold 79
16 Mercury 80
17 Lead 82
18 Uranium 92

Source: Periodic table.

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Frequently asked questions

What is the order of chemical elements by atomic number?

Lowest atomic number first: Hydrogen, Helium, Carbon, Nitrogen, Oxygen, Neon, Sodium, Aluminium, Calcium, Iron, Copper, Silver, Tin, Platinum, Gold, Mercury, Lead, Uranium.

Which comes first and which comes last?

Hydrogen comes first (1 protons) and Uranium comes last (92 protons) among the items in this quiz.

Where is this data from?

Periodic table.

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