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Atomic Structure
Element:
An element is a __________ substance that is made from a single type of atom.
Atom: The basic building block of matter, made up of sub
atomic particles.
(p+) - ____________ charged particles in the

Protons
nucleus

Neutrons (n) nucleus

Electrons (e-) _______________ charged particles
‘orbiting’ the nucleus
particles with ____________in the
Each element in the periodic table has two important numbers.
Smaller value
 ______________
 Corresponds to the position on the P.T
Larger Value
 _____________ of the atom
Atomic number = _______________.
There are the __________ number of electrons as protons
_________________________ = Atomic Mass(rounded) – Atomic #
EX.
Mg
Atomic # = 12
Atomic Mass = 24.3
 Protons = ________
 Electrons = _________
 Neutrons = _________
Bohr Model
 Named after Niels Bohr (1885 – 1962)
 Represented an atom as a central ‘nucleus’ with electrons orbiting around it in
different shells or ________________________
o 1st orbit holds a maximum of _____ electrons
o 2nd orbit holds a maximum of _____
electrons
o 3rd orbit holds a maximum of _____
electrons
 The _________________________ is that
outermost shell (orbit) that contains electrons
 Valence electrons are found in the valence shell and can be _________________.
 A atom is stable if all shells are ________________.
__________________: Not easily decomposed or otherwise modified chemically. They are
happy just the way they are!
Lewis Dot Diagrams
 A shorthand model that describes an atom and its ______________________.
 The symbol for the element replaces the nucleus and the inner full shell(s) of
electrons.
 The __________________________ (outermost shell) are represented by dots (●)
Ex.
Al