Science Units 4-5
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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| what is the "stair-step" line? | The zig-zaged line on the periodic table that indicates metalloids (on either side of it)
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| what is the significance of the stair-step line? | they are metalloids/semiconductors, they have some properties of metals and some of nonmetals, and have about a half complete set of electrons on the outer energy level.
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| what is the "magic" number of electrons in the outer shell? | 8 e-
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| On the periodic table, how are elements with similar properties arranged? | In groups/columns/families
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| what are the properties of alkali metals? | group 1, 1 electron in outer shell, very reactive, soft (can be cut w/ knife), silvery, shiny, low density, metals
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| how do you identify the number of protons in the nucleus of an element with the periodic table? | look at the atomic number
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| what are the properties of noble gases? | group 18, 8 electrons in outer shell (except for helium which has 2), nonmetals, unreactive, gases @ room temp, colorless, odorless
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| what are the properties of halogens? | group 17, 7 electrons in outer shell, very reactive (w/ alkali metals), poor conductors of electricity, nonmetal,never uncombined in nature, creates salts
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| what is the nucleus? | the atoms central region, which is made of protons and neutrons (and accounts for the majority of the mass)
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| what is an electron cloud? | a region around the nucleus where electrons are likely to be found
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| what is an electron? | a subatomic particle that has a negative charge
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| What are the 2 particles found in the nucleus of an atom? | proton and neutron
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| What is the charge of a proton? | positive
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| what is the charge of an electron? | negative
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| what is the charge of a neutron? | neutral
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| What happens as you go across a row on the periodic table? | the atomic number+ mass increases, as well as the number of electrons
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| mass number | the total number of neutrons and protons in the nucleus
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| atomic mass | weighted average of masses of all naturally occuring isotopes
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| atomic number | the number of protons in the nucleus
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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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Created by:
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