(An intuitive definition of mass) Properties of Matter: Density (An intuitive definition of density) The Elemental World (A world without chemical reactions) Chemical Bonding (Chemical bonding and attraction an intuitive approach to the definition of a chemical reaction) Properties of Elements (How the periodic table helps us to understand the elements and their reactions) Then What is a Metal?
(us; to understand; the elements and their reactions) (the periodic table; helps; to understand the elements and their reactions)
us the periodic table
to understand helps
the elements and their reactions
to understand the elements and their reactions