atomic structure nucleus – contains protons and neutrons electron cloud – area where electrons...
TRANSCRIPT
Atomic StructureNucleus – contains protons and neutrons
Electron Cloud – area where electrons are found
Neutron – particle with no charge
Proton – positively charged particle
Quarks – particles that make up protons and neutrons
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C12.0Carbon
Atomic Number- the number of protons
- usually the smallest number
Chemical Symbol
Element Name
Atomic Mass- usually the largest number
Atomic Number – the number of protons in an individual atom◦examples:
Hydrogen : 1 proton Oxygen : 8 protons
Mass number – the total of protons and neutrons in an atom◦# of neutrons = mass number – atomic
number◦examples:
Carbon-12 - 6 protons, 6 neutrons Oxygen-17 – 8 protons, 9 neutrons
Atomic Mass – the weighted average of the masses of all the naturally occurring isotopes of an element◦amu – atomic mass unit – unit for atomic
mass Each proton and neutron has a mass of
approximately 1 amu
◦example – Chlorine-35 makes up 76% of all chlorine in nature, and chlorine-37 makes up the other 24%:
(35 x 0.76) = 26.60(37 x 0.24) = 8.88
35.48 amu