The table below shows the number of the sub-atomic particles in an atom of nitrogen. Sub-atomic Particles

Sub-atomic Particle Number

Protons 7

Neutrons 7

Electrons 7

What is the amu of a nitrogen atom?

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14amu

Explanation:

Given subatomic particles:

  Number of protons  = 7

  Number of Neutrons  = 7

  Number of electrons  = 7

Unknown:

Atomic mass unit; amu of nitrogen

Solution:

The atomic mass unit of a substance is the number of protons and neutrons in such an atom;

     Atomic mass unit  = number of protons + number of neutrons

This is because the mass of an atom is concentrated in the nucleus;

   For the given specie;

        Atomic mass unit  = 7 + 7 = 14amu

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.

the answer

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