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what is the "stair-step" line?
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what is the significance of the stair-step line?
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Science Units 4-5
| Question | Answer |
|---|---|
| what is the "stair-step" line? | The zig-zaged line on the periodic table that indicates metalloids (on either side of it) |
| 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. |
| what is the "magic" number of electrons in the outer shell? | 8 e- |
| On the periodic table, how are elements with similar properties arranged? | In groups/columns/families |
| 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 |
| how do you identify the number of protons in the nucleus of an element with the periodic table? | look at the atomic number |
| 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 |
| 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 |
| what is the nucleus? | the atoms central region, which is made of protons and neutrons (and accounts for the majority of the mass) |
| what is an electron cloud? | a region around the nucleus where electrons are likely to be found |
| what is an electron? | a subatomic particle that has a negative charge |
| What are the 2 particles found in the nucleus of an atom? | proton and neutron |
| What is the charge of a proton? | positive |
| what is the charge of an electron? | negative |
| what is the charge of a neutron? | neutral |
| What happens as you go across a row on the periodic table? | the atomic number+ mass increases, as well as the number of electrons |
| mass number | the total number of neutrons and protons in the nucleus |
| atomic mass | weighted average of masses of all naturally occuring isotopes |
| atomic number | the number of protons in the nucleus |
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