ATOMIC STRUCTURE

Gap-fill exercise

  
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
In an atom, the number of protons is equal to the number of

When an atom gains an electron it has more number of electrons and thus it carries charge.

Ions are classified into two types. They are: and .

These atoms which carry positive or negative charges are called

when an atom loses an electron it has more number of protons and thus it carries charge.

If an atom loses one or more electrons during a chemical reaction, it will have more number of positive charge on it. These are called

A is a substance formed out of more than one element joined together by chemical bond.

The reactions taking place between various substances are governed by certain laws. They are called as the ‘Laws of ’.

Chemical formula is the shorthand notation of a of a substance

The law of conservation of mass states that during any chemical change, the total mass of the products is equal to the total mass of the .

If an atom gains one or more electrons during a chemical reaction, it will have more number of negative charge on it. These are called

A substance that takes part in and undergoes change during a reaction is .