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chemistry

QuestionAnswer
ancient philosophers regularly performed controlled experiments false
philosophers formulated explanations about the nature of matter based on their own experiments true
both democritus and dalton suggested that matter is made up of atoms true
daltons atmoic theory stated that atoms separate, combine, or rearrange in chemical reactions true
daltons atomic theory stated that matter is mostly empty space false
dalton was correct in thinking that atoms could not be divided into smaller particles false
daltons atomic theory stated that atoms of different elements combine in simple whole-numbers ratios to form compounds true
dalton thought that all atoms of a specific element have the same mass true
democritus proposed that atoms are held together by chemical bonds but no one believed him false
daltons atomic theory was based on careful measurments and extensive research true
proposed the nuclear atomic model rutherford
determined the mass-to-charge ratio of an electron thomson
calculated the mass of an electron millikan
proton P+) in the nucleus) relative charge is 1+) relative mass is 1)
neutron N^0) in the nucleus) relative charge 0) mass 1)
electron e+) surrounding the nucleus) charge 1-) mass 1/1840)
the number of neutrons in an atom is reffered to as its atomic number false
the periodic table is arranged by increasing atomic number true
atomic number is equal to the number of electrons in an atom true
the number of protons in an atom identifies it as an atom of a particular element true
most atoms have either a positive or a negative charge false
lead has an atomic number of 82. how many protons and electrons does lead have 82
oxygen has 8 protons. how many protons does oxygen have 8
zinc has 30 proton. what is the atomic number 30
astatine has 85 protons. what is the atomic number
rutherfordium has an atomic number of 104. how many protons and electrons does it have 104,104
polonium has an atomic number of 84. how many electrons and protons does it have 84,84
nobelium has an atomic number of 102. how many electrons and protons does it have 102,102
an isotope has atomic number 19 and mass number 39 19,19,20
an isotope has 14 electrons and a mass number of 28 14,14,14
an isotope has 21 neutrons and a mass number of 40 19,19,21
an isotope has an atomic number of 51 and mass number of 123 51,51,72
which of the isotopes in problems 13-16 are isotopes of the same element/ identify the element 13+15 same p+ and e- potassium
neon-22 22 Ne 10
helium 4 He 2
cesium-133 133 Cs 55
uranium-234 234 U 92
24 Mg 12 ^mass # and the bottom number is atomic number
the mass of an electron is smaller than the mass of a proton and neutron and is a tiny fraction of the mass of an atom
one atomic mass unit is 1/12 the mass of carbon-12 atom
the atomic mass of an atom is usually not a whole number because it accounts for both the relative abundance and the mass of each of the atoms isotopes
osmium what is the atomic number of osmium 76 Os 190.23 76
niobium what is the chemical symbol for niobium 41 Nb 92.906 Nb
osmium what is the atomic mass of osmium 76 Os 190.23 190.23 AMU
what units are atomic mass reported in AMU
how many protons and electrons does an osmium atom have? A niobium atom? OS-76 and Nb-41
the rays and particles that are emitted by a radioactive material radiation
a reaction that invloves a change in an atoms nucleus nuclear reaction
the process in which an unstable nucleus loses energy spontaneously radioactive decay
fast-moving electrons beta radiation
which plate do the beta particles ben toward explain positive because they have a negative charge and opposites attract
explain why gamma rays do not bend gamma rays have no charge
explain why the path of the beta particles bends more than the path of the alpha particles beta has less mass than alpha so its electric field pulls it easier
alpha composition-a helium nucleus) symbol- ) mass-4) charge-2+ 4 He 2
beta comp-electrons)symbol- )mass-1/1840) charge-1-) 0 B -1
gamma comp-high-energy electromagnetic radiation) symbol-0 mass-0 charge-0 (upside down fish) 0
do math on study guide and the models - -
Created by: dfratesi6
 

 



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