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29 Cards in this Set
- Front
- Back
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Which chemist wrote the names and properties of elements (including density, appearance, atomic mass, melting point and information about the compounds formed from the element. |
Dmitri Mendeleev |
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Mendeleev determined that there was a repeating pattern to the properties of the elements when they were arranged in the order of ______________ _________________. |
atomic mass |
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What is the meaning of when an element has a regular, repeating pattern? |
they are periodic |
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How many periods are on the periodic table |
7 |
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how many groups/families are there on the periodic table? |
18 |
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What states that the chemical and physical properties of elements are periodic functions of their atomic numbers? |
The Periodic Law |
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a row of elements is called a ___________ |
period |
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a column of elements is called a __________ |
group or family |
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The ___________ line reminds you where the metals, nonmetals and metalloids are. |
zig zag line |
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What elements are touching the zig zag line of the periodic table |
all of the metalloids |
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what elements are found on the left of the zig zag line on the periodic table? |
metals |
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what elements are found to the right of the zig zag line on the periodic table? |
nonmetals |
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What does each square on the periodic table contain about each element? |
atomic number, atomic mass, name and chemical symbol |
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in what groups are the most reactive metals found |
groups 1 and 2 |
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What kind of metals are soft enough to be cut with a knife and the most reactive and reacts very violently with water and has one valence electron? |
Alkali metals |
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What 3 alkali metals density are so low that they are less dense than water? |
lithium, sodium and potassium |
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what metals are not as reactive as alkali metals because it is more difficult for atoms to give away two electrons than to give away one electron when joining with other atoms and has 2 valence electrons? |
alkaline - earth metals |
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Groups of 3 through 12 don't have individual names instead these groups are described together under the name ____________. |
Transition metals |
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What elements are good conductors of heat and electricity. Some are hard and brittle and have a higher melting point than the first two families. They form brightly colored compounds. |
Transition elements |
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This group on the periodic table has the following: Five valence electrons in the 15th group is stable, which means it is not easily combined. most abundant in the earth's atmosphere |
Nitrogen family |
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This group on the periodic table has the following: 6 valence electrons in the 16th family very reactive , combines with many other elements They are very brittle |
Oxygen Family |
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This group on the periodic tables has the following: 7 valence electrons in the 17th family most chemically reactive non metals never found free or found in nature has a low melting and boiling point |
Halogen Family |
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This group on the periodic table has the following: Full valence electrons - He has only 2 electrons but Ne Ar Kr Xe and Rn have 8 electrons. It is inert which means it does not combine with other elements |
Noble Gases family |
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What 2 transition metals from Periods 6 and 7 are placed at the bottom of the periodic table to keep the table from being too wide. The properties of the elements in each row tend to be very similar. |
Lanthanides and Actinides |
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These follow the transition meytal lanthanum, they are shiny, reactive metals. Used to make different types of steel. |
Lanthanides |
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These follow the transition metal actinium. All atoms of this are radioactive which means they are unstable. Elements after element 94 do not occur in nature but are made in laboratories. |
Actinides |
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This group contains: one mealloid and four metals, it has 3 electrons in the outer level, it is reactive, it is solid at room temperature |
Boron Group |
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This Group contains: one non metal, two metalloids and two metals it has 4 electrons in the outer level its reactivity varies among the elements it is solid at room temperature |
Carbon Group |
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This element contains: it has 1 electron in the outer level it is reactive it is colorless, odorless gas at room temperature; low density, reacts explosively with oxygen |
Hydrogen |
