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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.

The atom is mainly empty.

  True

  False

 

2.

An atom consists of a central nucleus containing positively-charged protons and negatively-charged neutrons.

  True

  False

 

3.

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

  True

  False

 

4.

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

  True

  False

 

5.

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

  True

  False

 

6.

Hydrogen and oxygen are combined chemically in a fixed proportion of 2:1 in the compound water.

  True

  False

 

7.

Isotopes have similar chemical properties.

  True

  False

 


 
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