study notes for chapter 12 & 13
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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| element | a pure substance that can not be broken down by chemical or physical means and cant be put into a simpler substance
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| compound | a pure substance composed of 2 or more elements that are chemically combined
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| mixture | a combination of 2 or more substances that are not chemically combined
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| atom | the smallest particle into which an element can be divided and still retain all of the properties of that element
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| proton | the positively charged particles of the nulceus; the # of protons in the nucleusis the atomic # which determines the identity of an element
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| electron | the negatively charged particles found in all the atoms; electrons are involved in the formation of chemical bonds
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| neutron | the particles of the nucleus that have no charge
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| periodic | having a regular repeating pattern
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| periodic law | a law that states that the chemical and physical properties of the elements are periodic functions of their atomic #'s
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| atomic # | the # pf protons on the nucleus of an atom; the atomic # is the same for all atoms of an element
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| atomic mass | the weighted average of the masses of all the naturally occuring isotopes of an element
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| isotope | atoms that have the same # of protons but have different #'s of neutrons
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| vallence electron | the electrons in the outermost energy level of an atom; these electrons are involved in the forming chemical bonds
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| John Dalton | thought up the atomic theory
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| J.J. Thomson | thought up the thought of small particles in the atom
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| Ernest Rutherford | positive charged nucleus; atom mostly is empty space; electrons travel around nucleus
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| Niels Bohr | electrons travel in cluods
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| Democritus | 1st to come up with idea of atom
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| Demetri Mendeleev | father of the periodic table; arranged the elements by atomic mass
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| Henry Mosely | rearranged Periodic tabel by atomic mss
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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.
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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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Created by:
tsingh
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