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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.

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

  True

  False

 

2.

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

  True

  False

 

3.

The nucleus of an atom has almost the entire weight of the atom and it consists of protons and neutrons.

  True

  False

 

4.

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

  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.

Atoms are electrically neutral.

  True

  False

 


 
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