(a)
All substances are made of basic particles called
.
(b) Substances that are made of only one sort of atom are called
.
(c) The
table is laid out so that vertical columns of elements with similar
form so-called
of 'like' elements.
(d)
Atoms have small central
around which there are moving
.
(e) When atoms react, new chemical
are formed that hold the atoms together.
(f) Bonds are formed by atoms
electrons (giving or losing/taking or gaining) or
electrons.
(g) In a chemical
, elements are represented by chemical
and numbers indicate the number of
of each
of element in the compound.
(h) When different elements chemically combine together a
is formed.
(i) No
are lost or made in a chemical reaction and the
of the initial
equals the mass of the final
of the reaction.