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Chemistry Ch. 4

Terms in this set (13)

electron
a negatively charged subatomic particle
mass number
the total number of protons and neutrons in the nucleus of an atom
atomic number
the number of protons in the nucleus of an element
atomic mass
the weighted average of the mass of the atoms in a naturally occurring sample of an element
neutron
a subatomic particle with no charge
atomic mass unit
1/12 the mass of a carbon-12 atom
proton
a positively charged subatomic particle
isotopes
atoms with the same number of protons but different numbers of neutrons
atom
the smallest particle of an element that retains its identity in a chemical reaction
periodic table
an arrangement of elements in which the elements are separated into groups based on a set of repeating properties
no
in rutherford's experiment, did the results obtained that electrons are contained in the nucleus of an atom?
atomic mass
the relative abundance of each isotope of an element determines its
dalton's atomic theory
- all elements are composed of indivisible particles called atoms
- atoms of the same element are identical. the atoms of any one element are different from those of any other element.
- atoms of different elements can physically mix together or can chemically combine in simple whole-number ratios to form compounds
- chemical reactions occur when atoms are separated from each other, joined, or rearranged in a different combination. atoms of one element, however, are never changed into atoms of another element as a result of a chemical reaction
THIS SET IS OFTEN IN FOLDERS WITH...