Chemistry Chap 4.3
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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| Elements are different because they contain different numbers of _____. | protons
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| atomic number | number of protons in the nucleus of an element
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| Atoms are electrically _________. | neutral
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| mass number | total number of protons and neutrons in an atom
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| The number 197 in Gold-197 is the _________. | mass number
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| Atoms that have the same number of protons but different numbers of neutrons | isotopes
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| atomic mass unit | Defined as 1/12 the mass of a carbon-12 atom
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| atomic mass | weighted average mass of the atoms in a naturally occurring sample of an element
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| A weighted average mass reflects both the mass and the relative ________ of the isotopes as they occur in nature. | abundance
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| The periodic table allows you to _____ the properties of different elements. | compare
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| period | horizontal row on the periodic table
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| group | vertical column on the periodic table
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| Elements in the same ______ of the periodic table have similar properties. | group
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| Units used to measure atomic masses | amu
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| The number of neutrons in an atom is the difference between the ____ number and the ____ number. | mass, atomic
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| Elements are arranged in the periodic table in order of increasing ______ ______. | atomic number
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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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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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