Download Protons + Neutrons

ATOMS
Atom
Smallest part of any
element that contains all
properties of that
element.
The center of an atom. It contains
two particles: neutron and proton.
Has a positive charge.
3 main subatomic
particles are the proton,
neutron and electron.
THESE particles
are SMALLER than
an atom.
***LOOK at the
difference in size!!!
WOW…an electron
is SO SMALL!!!
Positively charged particle
found in the nucleus.
Proton
Neutron
Particle in the
nucleus of an
atom that does
not have a
charge. It is a
neutral
particle.
Particle
orbiting the
nucleus of an
atom. It has a
negative
charge.
 Valence Electrons – the
electrons in the
outermost energy
level/shell of an atom;
they determine how an
element will react with
other substances.
represents the number of
protons found in the atom’s
nucleus.
Mass Number
The sum of the number of protons
and neutrons found in the nucleus
of the atom for that element.
Protons + Neutrons=Mass Number
6
C
Carbon
12.011
Atomic
Number
Symbol
Element
Name
Atomic
Mass
Number of Protons
Equals
Number of electrons
This is what gives the
atom a neutral charge.
ATOMIC MASS
The average mass of one
atom of an element.
(atomic mass
unit)- the SI unit
for the masses of
particles in an
atom.
The Big
Picture!
Neutron
Proton
How many
neutrons does an
atom contain if
its atomic mass
is 65 and it
contains 30
protons?
Protons + Neutrons
=
?
Protons + Neutrons
=
Mass Number
What is the smallest part of
any element that contains all
properties of that element?
Atom
What are the particles
that are smaller than an
atom called?
Subatomic
Particles
What are the 3 main
subatomic particles that
make up an atom?
Proton
Neutron
Electron
What is the center of
an atom called?
Nucleus
What are the two
particles found in the
nucleus of an atom?
Proton
and
Neutron
What type of charge
does the nucleus of
an atom have?
Positive
What is the positively
charged particle found in
the nucleus?
Proton
The subatomic
particle that is
neutral is the
Neutron
What is the negative
charged particle that
orbits the nucleus of an
atom?
Electron
Why does the atom have
a neutral charge?
The number of protons in the
nucleus of an atom equals the
number of electrons orbiting
the nucleus.
How do we determine the
number of electrons in an
atom?
Number of electrons
equals the number of
protons.
The element chlorine
has an atomic
number of 17, it has
17
_____ protons in its
nucleus.
Mass
Number
Practice
How many
protons does
an atom have
if its atomic
mass is 12
and it has 6
neutrons?
What is the mass
number if an atom has 2
protons and 2 neutrons?
Which element has an
mass number of 12 and
contains 6 neutrons?
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