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Answered by Rideryash
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Explanation:

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What Are the First 20 Elements?

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Illustration of the first 20 elements in the periodic table

ThoughtCo.

By Anne Marie Helmenstine, Ph.D.

Updated February 05, 2020

One common chemistry assignment is to name or even memorize the first 20 elements and their symbols. The elements are ordered in the periodic table according to increasing atomic number. This is also the number of protons in each atom.

These are the first 20 elements, listed in order:

H - Hydrogen

He - Helium

Li - Lithium

Be - Beryllium

B - Boron

C - Carbon

N - Nitrogen

O - Oxygen

F - Fluorine

Ne - Neon

Na - Sodium

Mg - Magnesium

Al - Aluminum

Si - Silicon

P - Phosphorus

S - Sulfur

Cl - Chlorine

Ar - Argon

K - Potassium

Ca - Calcium

Answered by Anonymous
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\Large{\underline{\underline{\bf{Solution :}}}}

\small{\sf{\red{Atomic \: No.\: \: \: Name \: \: \: \: \: \: \: Mass \: Number}}}

\sf{\green{1 \: \: \: \: \: \: \: \: \: \: Hydrogen \: \: \: \: \: \: \: \: \: \: 1}}

\sf{\green{2 \: \: \: \: \: \: \: \: \: \:Helium\: \: \: \: \: \: \: \: \: \: 4}}

\sf{\green{3\: \: \: \: \: \: \: \: \: \: Lithium\: \: \: \: \: \: \: \: \: \: 7}}

\sf{\green{4\: \: \: \: \: \: \: \: \: \: Beryllium\: \: \: \: \: \: \: \: \: \: 9}}

\sf{\green{5\: \: \: \: \: \: \: \: \: \: Boron \: \: \: \: \: \: \: \: \: \: 10}}

\sf{\green{6\: \: \: \: \: \: \: \: \: \: Carbon\: \: \: \: \: \: \: \: \: \: 12}}

\sf{\green{7 \: \: \: \: \: \: \: \: \: \: Nitrogen\: \: \: \: \: \: \: \: \: \: 14}}

\sf{\green{8 \: \: \: \: \: \: \: \: \: \: Oxygen \: \: \: \: \: \: \: \: \: \: 16}}

\sf{\green{9 \: \: \: \: \: \: \: \: \: \: Fluorine\: \: \: \: \: \: \: \: \: \: 19}}

\sf{\green{10\: \: \: \: \: \: \: \: \: \: Neon\: \: \: \: \: \: \: \: \: \: 20}}

\sf{\green{11 \: \: \: \: \: \: \: \: \: \: Sodium\: \: \: \: \: \: \: \: \: \: 21}}

\sf{\green{12 \: \: \: \: \: \: \: \: \: \: Magnesium \: \: \: \: \: \: \: \: \: \: 24}}

\sf{\green{13 \: \: \: \: \: \: \: \: \: \: Aluminum \: \: \: \: \: \: \: \: \: \: 27}}

\sf{\green{14 \: \: \: \: \: \: \: \: \: \: Silicon\: \: \: \: \: \: \: \: \: \: 28}}

\sf{\green{15 \: \: \: \: \: \: \: \: \: \: Phosphorus \: \: \: \: \: \: \: \: \: \: 31}}

\sf{\green{16 \: \: \: \: \: \: \: \: \: \: Sulfur \: \: \: \: \: \: \: \: \: \: 32}}

\sf{\green{17 \: \: \: \: \: \: \: \: \: \: Chlorine \: \: \: \: \: \: \: \: \: \: 35.5}}

\sf{\green{18 \: \: \: \: \: \: \: \: \: \: Argon\: \: \: \: \: \: \: \: \: \: 40}}

\sf{\green{19 \: \: \: \: \: \: \: \: \: \: Potassium\: \: \: \: \: \: \: \: \: \: 39}}

\sf{\green{20 \: \: \: \: \: \: \: \: \: \: Calcium \: \: \: \: \: \: \: \: \: \: 40}}

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