Question

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what is hydrogen​

Answer 1

Hydrogen is a gas of the first group and first period.

• Hydrogen is the lightest element among every other element having atomic number 1 and atomic mass 1 as well.
• At normal conditions, hydrogen is a diatomic gas having the formula $H_{2}$.
• It is colourless, odourless, tasteless, non-toxic, and highly combustible gas which is used as fuel also.
• Hydrogen is the most abundant chemical substance in the universe which consist of almost 75% of all matter.
• Hydrogen is nowadays used in fuel cells to generate electricity, power and heat.