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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.

Atomic number of an element is the number of neutrons present in the nucleus of the atom.

  True

  False

 

2.

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

  True

  False

 

3.

The atom is mainly empty.

  True

  False

 

4.

Isotopes have same atomic number.

  True

  False

 

5.

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

  True

  False

 

6.

One atom of carbon and two atoms of oxygen combine to form a molecule of carbon dioxide [CO2].

  True

  False

 

7.

The smallest atom is that of hydrogen.

  True

  False

 


 
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