easily and freely - Science for elementary school, middle school and
Free online chemistry
lesson for elementary school, middle school and high school.
All matters around us (including
molecules) consist of microscopic particles called atoms.
There are different kinds of atoms (more than a hundred) that
constitute all existing materials.
Each atom is
represented by a symbol which begins with a capital letter, sometimes
followed by a lowercase letter.
letter often corresponds to the first letter)
Examples to remember:
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