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Chemistry : Atoms, Molecules, Elements and Compounds


Answer the following questions by choosing the appropriate option.

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Multiple choice

Your Performance  

1.

Isotopes have same atomic number.

  True

  False

 

2.

Electrons revolve around the nucleus in shells or orbits.

  True

  False

 

3.

An element is a substance made up of different kinds of atoms.

  True

  False

 

4.

Isotopes have same atomic weight.

  True

  False

 

5.

The number of electrons in a neutral atom is equal to its atomic number.

  True

  False

 

6.

Since an atom of the element sodium contains 11 protons and 12 neutrons, its atomic number is 23.

  True

  False

 

7.

In a neutral atom, the number of electrons and protons is equal.

  True

  False

 


 
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