Give an Atomic Number, Atomic Symbol, Atomic Mass of the First 20 Elements
By BYJU'S Exam Prep
Updated on: September 13th, 2023
Give an Atomic Number, Atomic Symbol, 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 number = Number of electrons/Number of protons
Furthermore, atomic symbols are shorthand notations for chemical elements and can be found on the periodic table. Each symbol is unique to a specific element and is derived from either the English or Latin name of the element. Lastly, atomic mass is the total mass of an atom, which is determined by the number of protons and neutrons in its nucleus.
Table of content
Atomic Number and Mass of First 20 Elements
Atomic symbols are the abbreviations that are used in Chemistry for the chemical elements. The atomic number determines the identity of the element, as each element has a unique atomic number. The element symbols for the chemical elements normally have one or two letters of the English alphabet and have the first letter capitalized.
Atomic mass is the mass of an atom and the atomic mass of first 20 elements is mentioned below. 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. The unit used to measure it is AMU (atomic mass unit).
|
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:
Give 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. The atomic number also helps to determine the chemical properties and behavior of the element. 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. The atomic number, symbols, and atomic mass of the first 20 elements are illustrated in the table format above.
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