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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.

Electrons revolve around the nucleus in shells or orbits.

  True

  False

 

2.

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

  True

  False

 

3.

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

  True

  False

 

4.

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

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

  True

  False

 

7.

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

  True

  False

 


 
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