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22 Cards in this Set

  • Front
  • Back
What is an atom?
tiny particles that make up elements
What is a nucleus?
tiny central core of an atom and is composed of protons and neutrons
What is a mass number?
total number of protons and neutrons in an atom
What are isotopes?
atoms in the same element that have same # of protons but different #'s of neutrons
What is an example of an isotope?
15
E
7
What is an example of a mass number?
total number of protons and neutrons
What is the number on the top of an isotopic notation?
ex://
15 <---
E
7
the mass number
What is the number on the bottom of an isotopic notation?
ex://
15
E
7 <---
atomic number
What is ANOTHER form of isotopic notation?
neon-20
What does amu stand for?
Atomic Mass Unit
What is amu?
relative mass of a standard reference isotope
What is atomic mass?
weighted average mass of the atoms in a naturally occuring sample of the element
How is atomic mass calculated?
amu x abundance
In a periodic table, what are columns called? Is this the energy level?
group/family
no
In a periodic table, what are rows called? Is this the energy level?
periods, yes
In _______ Democritus discovered/described ______.
~400 B.C.
~atomic philosophy-atoms r solid particles that r indivisible and indestructable
In ________ John Dalton discovered _______.
~1803
~transformed Democritus ideas on atoms into a scientific theory
In ______ JJ Thompson discovered ________.
~1897
~ electron
In ________ James Chadwick discovered ___________.
~1891-1974
~confirmed existence of neutron
In __________ Eugene Goldstein discovered ________.
~1850-1930
~ obsered cathode ray tube and found rays traveling opp. to cathode ray ---> composed of protons
Who discovered the plum pudding model?
JJ Thompson
Describe the plum pudding model?
atom is fillled with positively charged material is distributed and electrons were evenly distributed.