Argon is mono atomic gas.

Atoms cannot exist alone. They can only exist as groups called molecules.

Two different elements may have similar atoms

Name the elements is air?

What is a chemical formula?

What is a molecule?

How many elements are known at present?

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

Define the following terms with an example of each:
a. Element
b. Compound
c. Metal
d. Non-metal
e. Metalloid

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

Give an example for the elements derived from their Latin names

Write any five characteristics of compounds.

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

Matter is its simplest form is called ______________

Amolecule which contains only one atom is called _________ molecule

The most abundant type of atom is the universe is _____________

The graphite refill used is pencil is made of element called ___________

___________ exhibit properties of mater and have individual existence

____________ is the smallest particle of an element.

______________ is the total number atoms present in one molecule of an element, compound or a substance.

There are __________ hydrogen atoms in water molecule

The name copper was taken from ___________

The melting of ice is an example· of change in the states of matter.

The symbol of phosphorus is P.

The metal which is liquid at room temperature is Copper.

Non-metals are usually, good conductors of heat and electricity.

Metals are usually solids or gases at room temperature.