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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

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1.

Isotopes differ in the number of neutrons they have in their nucleus.

  True

  False

 

2.

The smallest atom is that of hydrogen.

  True

  False

 

3.

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

  True

  False

 

4.

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

  True

  False

 

5.

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

  True

  False

 

6.

Isotopes have similar chemical properties.

  True

  False

 

7.

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

  True

  False

 


 
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