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Atoms Proton Neutron Electron Atomic Mass Atomic Number, Lecture notes of Chemistry

Protons and neutrons are located in the nucleus (the center of the ... neutrons an atom possesses? Find the following for the aluminum atom: Atomic number.

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Science 7 Notes 18
1
Identify the
subatomic
particles and their
charges?
Where are the
subatomic
particles located
in an atom?
Atoms
Proton
Neutron
Electron
Atomic Mass
Atomic Number
Structure of an atom:
Atoms are made of smaller particles called subatomic particles:
Protons (positive)
Neutrons (neutral)
Electrons (negative)
Protons and neutrons are located in the nucleus (the center of the
atom).
Electrons are orbiting the nucleus.
The particles of opposite charges are attracted to each other, keeping
electrons near the nucleus
The # of electrons = # of protons
Structure of an Atom
Subatomic
Particle
Location
Charge
Mass
Proton
Nucleus of
the atom
Positive
1 amu
Neutron
Nucleus of
the atom
Neutral
1 amu
Electron
VERY
quickly
orbiting the
nucleus
Negative
Basically no
mass
Describe the
structure of an atom.
Be able to identify
the number of
protons, neutrons,
and electrons in an
atom.
pf3

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Identify the subatomic particles and their charges?

Where are the subatomic particles located in an atom?

Atoms

Proton

Neutron

Electron

Atomic Mass

Atomic Number

Structure of an atom:

 Atoms are made of smaller particles called subatomic particles:  Protons (positive)  Neutrons (neutral)  Electrons (negative)

 Protons and neutrons are located in the nucleus (the center of the atom).

 Electrons are orbiting the nucleus.

 The particles of opposite charges are attracted to each other, keeping electrons near the nucleus

 The # of electrons = # of protons

Structure of an Atom Subatomic Particle

Location Charge Mass

Proton

Nucleus of the atom

Positive 1 amu

Neutron

Nucleus of the atom

Neutral 1 amu

Electron

VERY

quickly orbiting the nucleus

Negative Basically no mass

Describe the structure of an atom.

Be able to identify the number of protons, neutrons, and electrons in an atom.

What does the atomic number of an atom represent?

How do the atomic numbers compare between different atoms?

If an atom has 12 protons, how many electrons does it have?

Where do you find the atomic mass of an element on the periodic table?

How do you get the atomic number from this value?

How do you calculate the mass of an atom?

What does the atomic mass of an atom represent?

Atomic Number:

 Number of protons in an atom

 Each atom has a different number of protons

 In atoms the number of protons always equals the number of electrons (making the atom neutral)

Below are the nuclei of 3 atoms. Which atoms are shown?

2 Protons = Atomic Number 2

Helium

4 Protons = Atomic Number 4

Beryllium

6 Protons = Atomic Number 6

Carbon

Mass Number

 Mass Number for an atom = number of protons PLUS neutrons

 For the Mass of a single atom, round the atomic mass on the

periodic table to the nearest whole number