Write the chemical formula and name the elements present in the following compounds:
a. Sodium chloride
b. Potassium hydroxide
c. Carbon dioxide
d. Calcium oxide
e. Sulphur dioxide

What do you understand by chemical formula of a compound? What is its significance?

Write the symbols for the following elements and classify them as solid, liquid and gas.
Aluminum, carbon, chlorine, mercury, hydrogen and helium

Classify the following as metals, non-metals and metalloids .
Sodium, Bismuth, Silver, Nitrogen, Silicon, carbon, chlorine, Iron, copper.

How many elements are known at present?

What is the expansion of IUPAC.

What is the Latin name of Sodium?

What is a chemical formula?

What is the atomicity of H₂SO₄?

Name the elements is air?