Hel
er.
c In
Atoms and Matter
By Cindy Grigg
diagram
helium
join
oxygen
iron
Directions:
example
molecule
negative
examples
number
simple
nucleus
part
simplest
joined
formula
molecules
same
Fill in each blank: with the word that best completes
Caption: A (1)
_
the reading comprehension.
of a
~)---------------- atom with two protons, two neutrons,
and two electrons.
Everything
is made from atoms. Atoms are very tiny "building
blocks." They make up all matter. Atoms make up elements and
(3)
. Everything
is made of atoms.
Atoms are made of smaller pieces. The biggest
(4)
of an atom is its nucleus. The
(5)
(normally)
neutrons. Protons have a positive electrical
"P".) Outside the nucleus are electrons.
has two kinds of particles.
charge. (Remember
They are called protons and
that proton and positive both start with
Electrons have a (6)
electrical
charge.
Hydrogen
A hydrogen
is a little different.
Hydrogen
is the lightest and (7)
atom is so (8)
, it doesn't have a neutron! When an atom has
(10)
the (9)
element.
of protons and electrons,
it is
called a neutral atom. The positive and negative electrical charges are balanced.
When something
is made of only one kind of atom, it is called an element. Gold and
(11)
properties
are two (12)
. Each element has
or traits that make it different from any other element.
A molecule
is made when two or more atoms chemically
by sharing electrons.
(13)
together
This is called a chemical or covalent bond. Water is a molecule
atom (14)
(15)
with two atoms of hydrogen.
made of one oxygen
The chemical
for water is H20. This formula tells what water is composed
of. It's
like the recipe for water.
The number of protons, neutrons,
unique number of protons, neutrons,
eight of each. (17)
(18)
and electrons determines
and electrons.
the kind of matter. Every element has a
Oxygen, for (16)
is found in our air as a diatomic
. This means it is made of two atoms. Its formula is 02'
, has