What is the Atomic Mass in Hydrogen?

Answer: The atomic mass of hydrogen is approximately 1.008 atomic mass units (amu).

Atomic mass is the weighted average mass of an atom of an element, considering the relative abundances of its isotopes. It is expressed in atomic mass units (amu), where 1 amu = 1/12th the mass of a carbon-12 atom.

Complete Answer:

Calculation of Atomic Mass of Hydrogen

The atomic mass of hydrogen is calculated by considering the abundance of its isotopes and their respective masses. Here’s how it works:

Hydrogen has three isotopes:

Protium (¹H): Mass = 1.0078 amu, Abundance ≈ 99.98%

Deuterium (²H): Mass = 2.014 amu, Abundance ≈ 0.02%

Tritium (³H): Mass = 3.016 amu, Abundance ≈ Trace amounts (radioactive)

To find the atomic mass:

i.e., (1.0078 × 0.9998) + (2.014 × 0.0002) + (3.016 × trace)

= 1.008 amu (approx.)

Properties of Hydrogen

Symbol: H

Atomic Number: 1

Atomic Mass: 1.008 amu

State at Room Temperature: Gas

Reactivity: Highly reactive, forms compounds like water (H₂O) and hydrocarbons.

Scientific Fact about Hydrogen

• Hydrogen is the lightest element in the periodic table.
• Around 75% of the universe’s elemental mass consists of hydrogen.
• It was the first element formed after the Big Bang!

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