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38 Cards in this Set

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1869, Russian,arranged the elements in order of increasing atomic mass; started to be a pattern
mendeleev
happen at regular intervals
periodic
1914, reorganized the periodic table into increasing atomic number
moseley
metals
nonmetals
metalloids
3 classification groups of elements
drawn into thin long wires
ductile
can be pounded ino thin sheets
malleable
found to the left of the zig zag line
metals
atoms of most _____ have few electrons in their energy level
metals
shiny, ductile, malleable, and good conductors of electrical current and thermal energy
metals
found to the right of the zig zag line
nonmetals
has almost a complete set of electrons in their outer energy level
nonmetals
aren't shiny, ductile, malleable; brittle solids; poor conductors of electrical currents
nonmetals
elements that border the zig zag line
metalloids
atoms of ____ have about 1/2 of a complete set of electons in their outer energy level
metalloids
have some properties of metals and nonmetals
metalloids
semiconductors
metalloids
each ___ is identified by a chemical symbol
element
each square on the table contains _____, ______, _____, and _____
element name, symbol, atomic#, and atomic mass
for most elements they have __ or __ letters in their symbol
1 or 2
newer elements have __ letters
3
rows that follow a repeating pattern of chemical and physical properties as you move across the row
periods
elements in the same _____ often have similar chemical and physical properties
group
metals
1 electron in outer level
very reactive
softness, color of silver, shininess, low density
Group 1: Alkali Metals
metals
2 electrons in outer level
very reactive, but less reactive than Alkali metals
color of silver, higher denstities than alkali metals
Group 2: Alkali-Earth Metals
all metals
1 or 2 electrons in outer level
less reactive than group 2
shininess, good conductors of electrical current and thermal energy
Group 3-12: Transition Metals
Periods 6 and 7 always in 2 rows at the bottom
Lanthanides and Actinides
1 metalloid and 4 metals
3 electrons in outer level
reactive
solids at room temp.
Group 13: Boron Group
1 nonmetal, 2 metals, 2 metalloids
4 electrons in outer level
reactivity varies
solids at room temp.
Group 14: Carbon Group
2 nonmetals, 2 metalloids, 1 metal
5 electrons in outer level
reactivity varies
solids at room temp. (except for nitrogen)
Group 15: Nitrogen Group
3 nonmetals, 1 metalloid, 1 metal
6 electrons in outer level
reactive
solids at room temp. (except for oxygen)
Group 16: Oxygen Group
nonmetals
7 electrons in outer level
very reactive
poor conductors of electrical current; violent reactions with alkali metals to form salts; never uncombined in nature
Group 17: Halogens
nonmetals
8 electrons in outer energy level(except helium 2 electrons)
unreactive
colorless, odorless, gases at room temp.
Group 18: Noble Gases
nonmetal
1 electron in outer level
reactive
colorless, odorless gas at room temp., low density
hydrogen
a pure substance that cannot be broken down into another substance
element
a pure substance made from one or more elements
compound
using electricity to break apart a compound
electrolysis
substance that speeds up a chemical reaction but is not changed
catalyst
compounds containing oxygen
oxides