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Atoms • Smallest possible unit into which matter can be divided, while still maintaining its properties. • Made up of: – protons – neutrons – electrons For example, what is the smallest possible unit into which a long essay can be divided and still have some meaning? + - + + + - - - - + Complete Atomic Structure Graphic Organizer

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Page 1: Atoms Smallest possible unit into which matter can be divided, while still maintaining its properties. Made up of: – protons – neutrons – electrons For

Atoms

• Smallest possible unit into which matter can be divided, while still maintaining its properties.

• Made up of:– protons– neutrons– electrons

For example, what is the smallest possible unit

into which a long essay can be divided and still have some meaning?

+

-++ +

-

-

- -+

Complete Atomic Structure Graphic Organizer

Page 2: Atoms Smallest possible unit into which matter can be divided, while still maintaining its properties. Made up of: – protons – neutrons – electrons For

Protons (+)

• Positively charged particles

• Help make up the nucleus of the atom

• Help identify the atom (could be considered an atom’s DNA)

• Equal to the atomic number of the atom

• Contribute to the atomic mass

• Equal to the number of electrons

+

+

+++

+++

-

-

-

-

--

-

- +

Complete Atomic Structure Graphic Organizer

Page 3: Atoms Smallest possible unit into which matter can be divided, while still maintaining its properties. Made up of: – protons – neutrons – electrons For

Neutrons

• Neutral particles; have no electric charge

• Help make up the nucleus of the atom

• Contribute to the atomic mass

+

+++

+++

-

-

-

-

--

-

- +

Complete Atomic Structure Graphic Organizer

Page 4: Atoms Smallest possible unit into which matter can be divided, while still maintaining its properties. Made up of: – protons – neutrons – electrons For

Electrons (-)• Negatively charged

particles• Found outside the nucleus

in shells ( 1st = 2, 2nd = 8, 3rd = 8 or 18, etc…)

• Smaller than protons and neutrons

• Equal to the number of protons

• Involved chemical bonding of other atoms

-

+

+++

+++

-

-

-

-

--

-

- +

Complete Atomic Structure Graphic Organizer

Page 5: Atoms Smallest possible unit into which matter can be divided, while still maintaining its properties. Made up of: – protons – neutrons – electrons For

Hydrogen (H) Atom

• Notice the one electron in the first orbital

+

-

Even though there are no neutrons present, Hydrogen is still considered an atom

+

-

= 1

= 0

= 1

How manymore

electronscan fit in the 1st orbital/ level?

Complete Atomic Structure Graphic Organizer

Page 6: Atoms Smallest possible unit into which matter can be divided, while still maintaining its properties. Made up of: – protons – neutrons – electrons For

Oxygen (O) Atom

• Notice the two electrons in the first orbital/level and the six in the second

+

++

+

+++

-

-

-

-

--

-

-+

+

-

= 8

= 8

= 8

How manymore

electronscan fit in the 2nd orbital/ level?

Complete Atomic Structure Graphic Organizer

Page 7: Atoms Smallest possible unit into which matter can be divided, while still maintaining its properties. Made up of: – protons – neutrons – electrons For

Sodium (Na) Atom• Notice the two electrons in the first orbital/level,

eight in the second, and one in the third

+

++

+

+++

-

-

-

-

--

-

-+

-

-

-

+

-

= 11

= 12

= 11

How manymore

electronscan fit in the 3rd orbital/ level?

Complete Atomic Structure Graphic Organizer

Page 8: Atoms Smallest possible unit into which matter can be divided, while still maintaining its properties. Made up of: – protons – neutrons – electrons For

The Atom’s “Center”

• Protons and neutrons are grouped together to form the “center” or nucleus of an atom.

-

+++

Notice that the electrons are not apart of the nucleus

--

Complete Atomic Structure Graphic Organizer

Page 9: Atoms Smallest possible unit into which matter can be divided, while still maintaining its properties. Made up of: – protons – neutrons – electrons For

Atomic Number

• The number of protons in the nucleus of an atom

+ ++ --

-What would be

the atomic number of this

atom?

Complete Atomic Structure Graphic Organizer

Page 10: Atoms Smallest possible unit into which matter can be divided, while still maintaining its properties. Made up of: – protons – neutrons – electrons For

Mass Number

• The total number of protons and neutrons in an atom’s nucleus

• Expressed in Atomic Mass Units (amu)– Each proton or neutron has a mass of 1 amu

+ ++ -

-

-What would be the

mass number of this atom?

+ 3

4

3 protons + 4 neutrons = a mass number of 7

amu

Why did we not account for the electrons when calculating

the mass number?

Complete Atomic Structure Graphic Organizer

Page 11: Atoms Smallest possible unit into which matter can be divided, while still maintaining its properties. Made up of: – protons – neutrons – electrons For

Atomic number equals the number of ____________ or ________________.

Atomic mass equals the number of ______________ + _______________.

The Atoms Family - Atomic Math Challenge

Atomic NumberSymbolNameAtomic Mass

protonselectrons protons

neutrons

Page 12: Atoms Smallest possible unit into which matter can be divided, while still maintaining its properties. Made up of: – protons – neutrons – electrons For

Assignment: Finish the rest of the worksheet. Come up front when finished for a stamp!

20 Minutes

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