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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.

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

  True

  False

 

2.

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

  True

  False

 

3.

In a neutral atom, the number of electrons and protons is equal.

  True

  False

 

4.

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

  True

  False

 

5.

Nucleus always contains a neutron.

  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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