Page 44 - Curriculum Visions Dynamic Book

Key facts about...
Nitrogen
Essential to life Has no taste
One of the few elements which is found uncombined in nature
Oxides of nitrogen are major sources of atmospheric pollution
Phosphorus
A colourless gas, chemical symbol N
Atomic number 7, atomic weight about 14
Not very reactive
Comprises about 78% of the Earth’s atmosphere by volume and 76% by mass (weight)
Essential part of many explosives
SHELL DIAGRAMS
The shell diagrams on this page are representations of an atom of each element. The total number of electrons are shown in the relevant orbitals, or shells, around the central nucleus.
Electron shell
Electron
Nucleus containing protons and neutrons (called nucleons)
A white element, chemical symbol P
As an element it glows in the dark
Burns on exposure to air
Used to make fertilisers
Essential to life
Atomic number 15, atomic weight about 31
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