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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.

Atoms are electrically neutral.

  True

  False

 

2.

Isotopes have similar chemical properties.

  True

  False

 

3.

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

  True

  False

 

4.

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

  True

  False

 

5.

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

  True

  False

 

6.

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

  True

  False

 

7.

An element is a substance made up of different kinds of atoms.

  True

  False

 


 
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