Atomic number | Element | Symbol | Atomic Mass Number |
1 | Hydrogen | H | 1 |
2 | Helium | He | 4 |
3 | Lithium | Li | 7 |
4 | Beryllium | Be | 9 |
5 | Boron | B | 11 |
6 | Carbon | C | 12 |
7 | Nitrogen | N | 14 |
8 | Oxygen | O | 16 |
9 | Fluorine | F | 19 |
10 | Neon | Ne | 20 |
11 | Sodium | Na | 23 |
12 | Magnesium | Mg | 24 |
13 | Aluminum | Al | 27 |
14 | Silicon | Si | 28 |
15 | Phosphorus | P | 31 |
16 | Sulphur | S | 32 |
17 | Chlorine | Cl | 35.5 |
18 | Argon | Ar | 40 |
19 | Potassium | K | 39 |
20 | Calcium | Ca | 40 |
Summary:
Given an atomic number, atomic symbol, and atomic mass of the first 20 elements.
An atomic number of an atom is equal to the number of electrons in an electrically neutral atom or the number of protons in the nucleus of an atom.
Atomic symbols are the abbreviations that are used in Chemistry for the chemical elements.
Atomic mass is the mass of an atom. It shows how many times an atom of an element is heavier than 1/12th the mass of one atom of carbon-12 of the mass of one carbon atom.
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