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10When iron is broken into tiny particles, its properties change.
An element is a pure substance.
Elements can be broken down into simpler substances by chemical process.
Copper is an element.
Scientists have discovered 118 elements.
All elements exist only in solid state.
Mercury and bromine are liquid elements at normal temperature.
Oxygen and hydrogen are gaseous elements.
Atom is the smallest particle that takes part in chemical reaction.
Atoms of different elements are identical.
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Which of the following is an element?
How many natural elements are discovered?
Which element exists in liquid state at room temperature?
Which of the following is a gaseous element?
An element is a substance which:
The smallest particle of an element is called:
Atoms of the same element are:
Which of the following is NOT an element?
How many artificial elements are there?
Which particles take part in chemical reactions?
A substance that cannot be broken into simpler form is called an ______.
Copper, iron and gold are examples of ______.
Scientists have discovered ______ elements in total.
______ elements occur naturally.
Mercury and bromine are in ______ state at normal temperature.
Hydrogen and oxygen are ______ elements.
The smallest particle of an element is called ______.
Atoms of the same element are ______.
Atoms take part in ______ reactions.
There are ______ types of atoms.