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Atoms-chapter 16


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different elements give off different
the law of definite proportions
in the 1790's a chemist names Proust discovered an important principle of chermistry called
the planetary model
Bohr's model looked like a miniature solar system so it was often called
to tell isotopes apart scientists assign them a special
compounds are added to the explosive mixture
Fireworks:color producing
barium burns
atom or atomic number
the number of protons in the nucleus determines the kind of
neutrons(n) are located in the
Ernest Rutherford was a
the positive charge of an atoms mass were concentrated in a tiny region called the
Nobel Prize in Chemistry in 1908
Ernest Rutherford won the
basic quantity
when a group of measure is quantized they are related to each other as multiples of a
atom's nucleus
a proton is a subatomic particle located in the
smallest subatomic particle
electrons(e) are the
Rutherford called positively charged particles in the nucleus
an atom cannot be created or destroyed in chemical reaction
Dalton suggested
the atoms of one element are different from the atoms of all other elements
Dalton suggested
elements in their natural state don't exist without a single
sodium burns
the caloric theory
Dalton's core-envelope model was based on
mass number
the sum of protons and neutrons is called the
atomic and mass number of an element with the chemical symbol
isotopic notation shows both the
neutral atom
the atomic number also tells us the number of electrons surrounding the nucleus in a
protons, neutrons & electrons
atoms are made of:
Thomson called the negatively charged particles
strontium burns
indivisible after all
J J Thomsom revealed that atoms were not quite
understand their structure
to understand how atoms work in the presence of other atoms we have to
scientific models have to be
ID number
an atomic number is an elements
the Father of Nuclear Physics
Ernest Rutherford is also known as
an atom cannot be subdivided into smaller particles
Dalton suggested
the atoms of an element are all alike
Dalton suggested
quantum model
atomic model developed in the 20th century in which tiny, dense atomic nucleus is surrounded by a "cloud" is called
elements are made of only atoms
Dalton suggested
in 1932 James Chadwick discovered
spherical region surrounding ther nucleus
electrons occupy a
Ernest Rutherford discovered the nucleus of the atom in
decimals because they represent averages of measured quantities
atomic masses are always expressed in

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