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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.

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

  True

  False

 

2.

The nucleus consists of protons and neutrons and is negatively-charged.

  True

  False

 

3.

Isotopes have same atomic weight.

  True

  False

 

4.

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

  True

  False

 

5.

Isotopes have similar chemical properties.

  True

  False

 

6.

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

  True

  False

 

7.

Nucleus always contains a neutron.

  True

  False

 


 
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