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20 Cards in this Set
- Front
- Back
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chart of the elements arranged into rows and columns according to their chemical and physical properties |
periodic table |
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table can be used to determine how all _____ are related to one another |
elements |
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in the mid 1800s Russian chemist and teacher ______ created a table to help classify the elements by their properties |
Dimitri Mendeleev |
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he placed the elements in rows of increasing atomic _______ |
mass |
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the elements in the table showed repeating patterns; _______ is a word used to describe such patterns |
periodic |
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for example, Mendeleev noticed patterns in the __________ of elements, the temperature at which a solid changes to a liquid |
melting point |
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after arranging the known elements in a periodic table, Mendeleev noticed large gaps between some elements. he predicted that scientists would find __________ to fit into these spaces. Mendeleevs predictions were __________. |
elements. true |
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in the early 1900s, Henry Moseley found that the problems with Mendeleevs table could be solved if the elements were arranged in rows by _______--- |
atomic number |
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the atomic number is the number of _________ in the nucleus of an atom of an element |
protons |
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you can identify the properties of an element by studying its ________ on the periodic table |
placement |
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the ________ shows the elements name, atomic number, chemical symbol, state of matter, and atomic mass |
element key |
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a ________ is a column on the periodic table |
group |
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elements in the same group have similiar __________ which means they react with other elements in similar ways |
chemical properties |
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the rows in the periodic table are called _______ |
periods |
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as your read from left to right across the periodic table, atomic number _________ by one for each element |
increases |
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most of the elements in the periodic table are ______ which are shiny and conduct thermal energy and electricity |
metals |
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most nonmetals are on the _________ side of the periodic table; these elements do not conduct thermal energy and electricity |
right |
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between the metals and nonmetals on the periodic table are the ________ which have properties of metals and nonmetals |
metalloids |
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scientists use the periodic table to predict the __________ of the new elements they create |
properties |
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elements that are _____ each other on the periodic table share similiar properties |
near |
