nitrogen (N), phosphorus (P) and potassium (K)
a collection of more than one pure substance in no fixed proportion.
the gaseous envelope that surrounds the Earth.
a group of atoms that are bonded together. It has an unequal number of protons and electrons and...
the levels of energy in which electrons move and which have fixed amounts of energy.
a group of organic compounds obtained by oxidation of alcohols.
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