The first element on the periodic table is Hydrogen, which has the atomic number 1. It is the lightest and most abundant element in the universe. Hydrogen is a colorless, odorless, and highly flammable gas.
The main gas found in the air we breathe is Nitrogen. Nitrogen makes up about 78% of the Earth’s atmosphere. It is a colorless, odorless, and tasteless gas that is essential for life. Nitrogen is crucial for the synthesis of proteins and nucleic acids in living organisms. Oxygen, which makes up about 21% of the atmosphere, is also vital for respiration and energy production in most living beings.