Which of the following is a short and scientific way of representing one molecule of an element or compound?

The metals which is a liquid at room temperature is _______.

The most abundant type of atom is the universe is _____________

_____________ is a substance that is made up of three oxygen atoms chemically combined.

A molecule containing three atoms is called a __________ molecule

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.

What is a molecule?

What is a chemical formula?

Name the elements is air?

List out the metals, non-metals and metalloids which you use in your house, schools. Compare their properties.

What changes take place in the movement and arrangement of particles during heating process?

What are the 3 most abundant atoms on the earth?

Give an account of elements known to us

Write any two properties of a compound.

Explain the characteristics of compounds

(i) Draw the symbol for some elements as proposed by Dalton.
(ii) What are rules to be followed while assigning symbol to element.