Development of Periodic Table
Types of Elements
Representative Elements
Transition Elements
Hodgepodge
100
Russian Chemist who published first version of Periodic Table; arranged it by atomic mass; some elements were missing
What is Dmitri Mendeleev
100
solid element that has luster; it is a good conductor of electricity; is malleable and is ductile
What is metal
100
Silvery solid with low density and melting point; high reactivity rate; found in group 1
What is alkali metals
100
Substance that can make something happen faster, but is not changed itself
What is catalyst
100
group 13; used to make a variety of products; all metals except for boron
What is boron family
200
English physicist who improved Mendeleev's version of the periodic table; arranged it by atomic number instead of atomic mass
What is Henry Moseley
200
Usually a gas or brittle solid; poor conductor of heat and electricity; only 17 of them
What is nonmetal
200
found in group 2; denser and harder and has a higher melting point than the alkali metal in the same period
What is alkaline earth metal
200
First series of Inner transition elements; also called rare earths
What is lanthides
200
group 14; has semiconductors; all metals
What is carbon group
300
A row of elements in the periodic table whose properties change gradually and predictably; Periodic Table has 18 of them
What is period
300
Element between metal and nonmetal; shares some properties with metals and some with nonmetals; also called semimetal
What is metalloid
300
Doesn't conduct electricity as well as a metal, but better than a nonmetal
What is semiconductor
300
Second series of inner transition elements
What is actinides
300
group 15; 2 nonmetals; 3 metals; elements are part of the biologic materials that store genetic info and energy in living things
What is nitrogen group
400
Contains elements that have similar physical or chemical properties
What is group
400
Represents elements on the Periodic Table
What is element key
400
group 17 and nonmetals; called "salt formers"
What is halogens
400
made in laboratories and nuclear reactors
What is synthetic elements
400
group 18; all gasses; all elements are found uncombined
What is noble gasses
500
Groups 1/2 and 13-18 on periodic table; contains metals, metalloids, and nonmetals
What is representative elements
500
1 or 2 letter abreviation based on an element's name
What is symbol
500
group 18; only found as uncombined element in nature; reactivity is very low
What is noble gasses
500
Iron, Cobalt, and Nickel; Period 4 have magnetic properties
What is Iron Triad
500
soft metals; not as rare as originally thought
What is lanthides
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