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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.

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

  True

  False

 

2.

The atom is mainly empty.

  True

  False

 

3.

Electrons are present in the nucleus.

  True

  False

 

4.

Electrons revolve around the nucleus in shells or orbits.

  True

  False

 

5.

The elements are arranged in order of decreasing atomic numbers in a table called the periodic table.

  True

  False

 

6.

Atomic weight of an element is the mass of an atom of that element in grams.

  True

  False

 

7.

Of a proton, neutron and an electron, the electron is the lightest.

  True

  False

 


 
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