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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.

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

  True

  False

 

2.

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

  True

  False

 

3.

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

  True

  False

 

4.

Electrons revolve around the nucleus in shells or orbits.

  True

  False

 

5.

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

  True

  False

 

6.

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

  True

  False

 

7.

One atom of carbon and two atoms of oxygen combine to form a molecule of carbon dioxide [CO2].

  True

  False

 


 
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