Atomic Structure Notes section 1.1 (Chemistry Text book) Pg. 26

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Atomic Structure Notes section 1.1 (Chemistry Text book) Pg. 26-27 ISN
Learning Goal: Understand the periodic table organizes the elements according to their atomic structure and
chemical reactivity.
 Atomic structure
All matter is made of
 There are over 100 basic elements that make up everything
elements
 Elements may be by themselves or in combinations
 Hydrogen accounts for about 90% of the total mass of the universe
(pg. 9-10 text)
 Elements in earth’s crust: oxygen, silicon, aluminum, iron, other
 Elements in human body: oxygen, carbon, hydrogen, nitrogen
 Each element has a name and symbol.
 Symbols are one or two letters. The first letter is ALWAYS capitalized,
the second letter is ALWAYS lowercase.
Each element is made
 Atoms have three types of particles: protons, neutrons, and electrons
of a different atom
(pg 11 text)
Protons
 _______________ charged
 Atomic mass unit of ________
 Located in the ________________
Neutrons
 _______ charge
 Atomic mass unit of __________
 Located in the ____________
Nucleus
 _______________ of the atom
 Contains ____________ and ____________
 _________________ charged
Electrons
 ________________ charged particles
 Move around ______________ of nucleus
 Approximately __________ atomic mass units
Atomic Number
 Number of ______________ in the nucleus
 Specific to the atoms for each ________________
(pg. 12 text)
 Examples: hydrogen- atomic number ______, gold- atomic number
______, means ______ proton in hydrogen atoms and _______ protons
in gold atoms
Atomic Mass Number
 Total number of ______________and __________ in an atoms nucleus
 Not all atoms of an element have the __________ atomic mass number
(pg 12 text)
 The number of ____________ is CONSTANT, but the number of
______________ can change
Isotope
 Atoms of the same element that have a different number of _________
(pg. 12-13 text)
 Examples: all chlorine atoms have _____ protons (Atomic number),
some have 18 neutrons or 20 neutrons- those are isotopes
Calculate the number
 Atomic mass number – atomic number
of neutrons
 (protons + neutrons) – protons = neutrons
Ions
 Formed when an atom gains or loses ______________
 Has an ____________charge (number of protons does not equal
(pg 14-15 text)
number of electrons)
 Positive ions form when atoms _________ one or more electrons
 Negative ions form when atoms _________ one or more electrons
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