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What is Mendeleev's periodic table?
- -It arranges elements into rows of increasing mass (increasing the knowledge of scientists)
- -Elements with similar properties in the same column(similar, same. like twins)
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Why did Mendeleev leave spaces in the table?
For elements not yet discovered
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Was Mendeleev the first to organize the table?
No
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What did Mendeleev have the best explaination for?
How properties related to location in the table
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There was a close match between Mendeleev's _________ and _________ properties of elements showed how useful periodic table could be
Give an Example
- predictions and actual
- Eka-aluminum (gallium)
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In the periodic table, what are the elements arranged by?
Increasing atomic number (WHO has the BIGGEST NUMBER??)
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What is the period?
A row in the periodic table
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The number of elements in a period change with _____________(increasing or decreasing) number of _______ available in higher energy levels
Increasing/ Orbitals(orbitals need energy to run[orbit] around)
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What are the columns on the periodic table?
Groups
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Elements in a group have similar _________ configuration, which results in similar ________ properties
Electron/ Chemical
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What is the pattern of repeating properties called?
Periodic law (the law will never change, so it keeps repeating)
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What depends on isotopes and thier abundance, and is also a weighted average?
Atomic mass (WEIGHTED AVERAGE!!!!!)
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What is a UNIT that is equal to 1/12 the MASS of a carbon-12 ATOM?
Atomic mass unit
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What are some key points about metals? (list 3)
Good conductors, Most are malleable, and many are ductile
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What groups are transition metals?
Groups 3-12
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Transition metals form a bridge between elements on what?
Right and left side
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Do transition metals form compounds with distinctive colors?
Yes (for red to TRANSITION to purple, it needs blue. red and blue are a COMPOUND, both making the TRANSITION to something else)
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Nonmetals are _____ (poor or good) conductors, many gases are at ______ (hot, cold, room) temperature, if solid, they tend to be _______ (hard, soft, brittle) ________ is the most reactive nonmetal
Poor, Room, Brittle, Fluorine
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What are some of the inner transition metals?
Lanthanides and actinides
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What are the properties called that fall between metals and nonmetals?
metalloids
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Metalloids have the ability to conduct electricity but it varies with ___________
Temperature
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Elements tend to become ____ metallic and _______ nonmetallic as you go from left to right.
less/more
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Which side are most reactive metals found? Which side are most nonmetals found?
Left side/right side
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As you move from left to right, the metals become _______ reactant while nonmetals become _______ reactant.
less/more
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What is the electron that is in the highest occupied energy level of an atom called?
Valence electrons
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Do elements in the same group have the same number of valance electrons?
Yes
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Alkali Metals belong to group _____, have ____ valance electrons, and reactivity ________ (increases, decreases) from top to bottom
1A, 1, increases
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Alkali Earth Metals belong to group________, have ______ valance electrons, and are (harder or softer) than metals in group 1A
What are two examples?
- 2A, 2, harder
- Calcium (bones and teeth) and Magnesium (chlorophyll)
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Boron belongs to group _______, has _______ valance electrons
_________ is the most abundant metal in earth's crust
- 3A, 3, Aluminum
- *Boron is also found in lab glassware
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Carbon belongs to group _______,have _________ valance electrons
- Contains a nonmetal, ___ metalloids, and ____ metals
4A, 4, 2,2
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Could life exist without carbon?
What is the 2nd most abundant in crust? (boob jobs hahaha)
No, Silicon
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Nitrogen belongs group _______, ____ nonmetals, ___ metalloids, ____ metal----- has a ______ (wide or narrow) range of properties-----nitrogen is important for _______ (gotta freeze the poop!!)
5A, 2,2,1, wide, fertilizer
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What are isotopes?
Atoms of a given element that have different #s of neutrons and different mass number
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