Definitions for Unit 2: PT
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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Periodic Trend | a regular variation of certain characteristics of elements to increase or decrease along a row or column of the periodic table of elements
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Atomic Number | the number of protons in the nucleus of an atom; the number of electron on the electron clouds; used to determine that element's position in the periodic table
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Valence Electrons | electrons in the last shell or energy level of an atom
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Reactivity | tendency of a substance to undergo chemical changes in a system
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Groups | a vertical column that contains elements having the same number of electrons in the outermost shell of their atoms.
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Periods | Any of the seven horizontal rows.All the elements in a particular period have the same number of electron shells in their atoms
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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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