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

The most abundant type of atom is the universe is _____________

Amolecule which contains only one atom is called _________ molecule

Matter is its simplest form is called ______________

The name copper was taken from ___________

There are __________ hydrogen atoms in water molecule

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

____________ is the smallest particle of an element.

___________ exhibit properties of mater and have individual existence

Metals are usually solids or gases at room temperature.

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

The metal which is liquid at room temperature is Copper.

The symbol of phosphorus is P.

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

Two different elements may have similar atoms

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

Argon is mono atomic gas.

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

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

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 a molecule?

What is a chemical formula?

Name the elements is air?

Give an example for the elements derived from their Latin names

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

Write any five characteristics of compounds.