30DEC20WED

(01) What is the gas present in the sun and the stars?

Hydrogen

Its symbol is H.

(02) The hydrogen present in the sun and the stars keeps changing all the time. What does it change into?

The hydrogen in the sun and the stars changes to Helium.

The symbol of Helium is He.

(03) What is the gas we breathe in?

Oxygen

Its symbol is O.

(04) What is the gas we breathe out?

Carbon dioxide

Its symbol is CO2.

When a carbon atom joins two oxygen atoms, it forms carbon dioxide.

(05) What elements make water?

H and O

Symbol of water: H2O

When two hydrogen atoms and an oxygen atom combine, water is formed.

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