11 terms

Unit 2 Atomic Structure_ Part 1

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atom
The smallest component of an element having the chemical properties of the element
proton
A subatomic particle that has a positive charge and a mass of 1 amu that is found in the nucleus of an atom
electron
A subatomic particle that has a negative charge and no mass that is found outside of the nucleus
neutron
A subatomic particle that has no charge and a mass of 1 amu that is found in the nucleus of an atom
atomic number
Number of protons in an atom
atomic mass
The mass (in amu) of an isotope of an element
average atomic mass
The weighted average of the atomic masses of the naturally occurring isotopes of an element
mass number
The sum of protons and neutrons in the nucleus of an isotope of an element.
element
A pure substance that cannot be broken down into any other substances by chemical or physical means
isotope
Atoms of the same element that have different numbers of neutrons
atomic mass unit (amu)
The mass of 1/12 the mass of a carbon-12 atom