Atomic History & Scientists
Etymology & Language Roots
Subatomic Particles & Isotopes
The Mole & Conversions
Chemical Formulas & Mass Spectrometry
DOUBLE
100
The ancient Greek philosopher whose theory of "Atomism" stated that matter is composed of indivisible and indestructible particles called "atomos".
Democritus
100
The word "subatomic" comes from Greek and Latin roots that literally mean this.
below the atom
100
These two subatomic particles reside in the nucleus and contribute to an atom's mass.
protons and neutrons
100
Avogadro’s number 6.022 x 1023 represents this fundamental measurement unit.
number of items/particles in one mole
100
Out of C6H12O6, S2F10, Fe3O3, and N2O5, this is the only empirical formula.
N2O5
100
Detail the three major components of Rutherford's Gold Foil Experiment: what he shot, what he observed, and what he concluded.
1) Fired alpha particles at thin gold foil,
2) Observed that most passed straight through while a few deflected at sharp angles,
3) Concluded the atom is mostly empty space with a small, dense, positive nucleus
200
The scientist whose "Solid Sphere Model" and Atomic Theory of Matter stated that atoms are indivisible units that retain their identity in chemical reactions.
Dalton
200
The word "atom" comes from the Greek roots "tom" and "a-", which mean these two terms respectively.
uncuttable and without
200
These two subatomic particles carry electrical charge and determine an atom's net charge.
protons (+1) and electrons (-1)
200
Atomic mass units amu are directly interchangeable with this laboratory unit of measurement.
grams per mole (g/mol)
200
The percent by mass of carbon in carbon dioxide (CO2).
27.3%
200
A compound is found to contain equal parts sulfur and oxygen by mass. This is its empirical formula.
SO2
300
He discovered the electron using a cathode ray tube and proposed the "Plum Pudding Model".
Thomson
300
The word "isotope" combines the Greek word "iso", meaning "same", and "tope", meaning this.
position
300
This subatomic particle determines the chemical behavior of an element.
electron
300
The mass in grams of 1.24 mol of oxygen atoms is...?
19.8g of oxygen
300
A compound is made of 24.0g of carbon and 4.0g of hydrogen. This is its empirical formula.
CH2
300
If an element with 3 natural isotopes were to have equal abundance among all isotopes on a mass spectrometer graph, this percentage height would be drawn for each peak.
33%
400
He conducted the Gold Foil Experiment, discovering that atoms are mostly empty space with a small, dense, positively charged nucleus.
Rutherford
400
The word "electron" comes from the Greek word for this fossilized tree resin.
amber
400
The sulfur isotope represented as 
contains this exact number of protons, electrons, and neutrons.
16 protons, 16 electrons, and 16 neutrons
400
The total number of lead atoms present in 2.46 mol of lead.
1.48 x 1024 atoms
400
A hydrocarbon compound has an empirical formula of CH2 and a molecular mass of 56 g/mol. This is its molecular formula.
C4H8
400
Calculate the average atomic mass of Copper using Cu-63 (62.9296amu, 69.17%) and Cu-65 (64.9278amu, 30.83%) to four significant figures.
63.54amu
500
Name the four scientists credited with discovering the proton, neutron, electron's charge magnitude, and the electron's charge-to-mass ratio.
Goldstein (proton),
Chadwick (neutron),
Millikan (electron charge magnitude)
Thomson (charge-to-mass ratio)
500
The word "proton" comes from the Greek for "first/primary", while "nucleus" comes from the Latin for this.
the little nut
500
Bromine has two major isotopes, Br-79 and Br-81, and an average atomic mass of 79.904 amu. This statement describes their relative natural abundance.
Br-79 and Br-81 exist in approximately equal proportions (or Br-79 is slightly more abundant)
500
For a neutral Beryllium (Be) atom, these are its atomic number, atomic weight, proton count, electron count, and neutron count.
Atomic Number = 4,
Atomic Weight = 9.012 amu,
Protons = 4,
Electrons = 4,
Neutrons = 5
500
A mass spectrum shows three peaks for Magnesium at 24amu (79%), 25amu (10%), and 26amu (11%). This is the calculated average atomic mass.
24.32amu
500
What GMP stands for in chemistry/manufacturing regulations and which U.S. agency regulates it.
Good Manufacturing Practices