Atoms, Molecules & periodic table

ATOMS are the basic building blocks of everything you can see around you, and even lots of things you can't see, like the air that you breathe.
Most elements in their absolute form live as unique atoms. For example, a macroscopic lump of iron metal is formed, microscopically, of individual iron atoms.
elements exist as groups of atoms called molecules. Several important elements exist as two-atom combinations and are called diatomic molecules.
Atoms are formed by extremely small subatomic particles called protons, neutrons, and electrons.
A MOLECULE may comprise a single chemical element, oxygen (O2), or multiple elements, like water (H2O).
Molecules are neutral and have no charge; this property distinguishes them from polyatomic ions, such as nitrate (NO3–).
The absolute elemental composition can be precisely represented by its molecular formula, which indicates the exact number of atoms in the molecule.
C6H12O6 = molecular formula for glucose.

PERIODIC TABLE:

The periodic table enables us to ascertain how many protons (and therefore electrons) an element will have by showing each element box's atomic number (Z).
Equally useful, the periodic table is set up to represent the different quantum numbers to facilitate the electron configuration of an element.
The principal quantum number (n) or the number of shells present in an element are shown in the periods or rows of the periodic table.

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