Chem 105 Ch 2
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Subatomic particles | protons, neutrons, and electrons
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| Thomson cathode ray tube experiment | found mass-to-charge ratio of election
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| Cathode rays | beam of electrons
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| Electrons | negatively charged subatomic particle with a very small mass (9.109x10^-31g)
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| Millikan oil drop experiment | mass of an electron
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| Cations and anions | positive and negative ions respectively
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| Rutherford gold foil experiment | shot positive helium nuclei at gold foil, most go through, some reflected a little, some completely; found most of atom is empty space with a dense nucleus
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| Atomic nucleus | nucleus contains protons and neutrons, protons always the same for an element, neutrons may differ
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| Atomic mass units | one twelfth the mass of carbon 12
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| 1 amu | 1.66054x10^-27 kg
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| Nuclide/isotope | different number of neutrons
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| Atomic number | number of protons
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| Mass number | sum of protons plus neutrons
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| Periodic table | chart of elements in order of atomic number, reflect physical
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| Periods | rows
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| Groups | columns
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| Main group elements | everything but
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| Metals | everything left of metalloids
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| Alkali metals | group 1
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| Alkaline earth metals | group2
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| Transition metals | d level
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| Metalloids | steps
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| Nonmetals | not a metal, right of metalloids
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| Halogens | group 17
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| Noble gases | group 18
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| Atomic mass | weighted average of natural abundance of isotopes
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| Natural abundances | percentage of
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| Formula mass | for formula unit
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| Mole | chemist's dozen
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| Avogadro’s number | 6.0221x10^-23
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| Molar mass | mass per mole of an element
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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