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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.

An atom consists of a central nucleus containing positively-charged protons and negatively-charged neutrons.

  True

  False

 

3.

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

  True

  False

 

4.

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

  True

  False

 

5.

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

  True

  False

 

6.

Isotopes have same atomic number.

  True

  False

 

7.

Neutrons are negatively-charged.

  True

  False

 

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