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Atomic History
Elements
Protons, Neutrons, Electrons
Atomic Mass
g --> mol --> atoms
100
first person to define an atom
What is Democritis
100
sodium
What is Na
100
this element has 31 protons and 36 neutrons
What is Gallium
100
what is the atomic mass of calcium
What is 40
100
how many grams are in 1.80 mol of titanium
What is 86.2 grams Ti
200
famous for his Gold Foil Experiment
What is Rutherford
200
iron
What is Fe
200
this element has 17 electrons
What is chlorine
200
the mass of an element having 42 protons and 49 neutrons
What is 91
200
the number of atoms in 6.3 mol Al
What is 3.8 x 10 24
300
Discovered electrons
What is JJ Thomson
300
chromium
What is Cr
300
this element's atomic number is 12 and atomic mass is 24
What is magnesium
300
which element has an isotope that has 74 neutrons and a mass of 127
What is iodine
300
moles in 52.38 grams silicon
What is 1.865 mols Si
400
planetary model of the atom
What is bohr
400
silver
What is Ag
400
this element has 54 neutrons and 42 electrons
What is Mo
400
3. Calculate the average atomic mass of gold with the 50% being gold-197 and 50% being gold-198
What is 197.5 g/mol
400
number of grams in 3.67 x 10 23 atoms potassium
What is 23.8 grams K
500
father of atomic theory
What is dalton
500
rubidium
What is Rb
500
this element has a mass of 206 and 124 neutrons
What is Pb
500
2. Iodine is 80% 127 I, 17% 126 I, and 3% 128 I. Calculate the average atomic mass of iodine.
What is 127 g/mol
500
number of atoms in 56.4 grams Lithium
What is 4.89 x 10 24 atoms Li