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Cornell Notes 2
Topic: Atomic Structure, Periodic Table,
Valence Electrons
Unit 3 Lessons 1, 2, 3

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Questions / Main Ideas /
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Notes / Answers / Definitions / Examples /
Sentences

Atom

Is the smallest Particle into which an element
can be divided and still be the same element
...


Electron

Negatively charged particles later became
known as electrons
...


Nucleus

A small dense Center that has a positive charge
and is surrounded by moving electrons
...


Mass Number

The total number of protons and neutrons in an
atom's nucleus is its mass number
...


Periodic Table

Mendeleev’s its arrangement of the elements
became known as the periodic table
...


Nonmetal

are poor conductors of heat and electricity
...


Group

each vertical column of elements (from top to
bottom) on the periodic table is called a group
...


Chemical Symbol

a 1 2 or 3- letter abbreviation of the name of an
element

Valence Electron

electrons found in the outermost energy level
of an atom Bohr model are called valence
electrons

Chemical Bond

Is an interaction that holds atoms or ions
together

Compare the charges and
masses of protons, neutrons,
and electrons
What is the atomic number of a
sodium atom that has 11
protons and 12 neutrons?

11 Atomic number

Elements in the same __1__ on
the periodic table have the
same number of valence
electrons
...

Atoms can gain, lose, or share
electrons during a chemical
change
...
How many
valence electrons does an atom
of sulfur have?

16

Summary:An Atom Is Is the smallest Particle into which an element can be divided
and still be the same element
...




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