Sec 1
Sec 2
Sec 3
Misc
More Misc
100
a row a elements whos properties change gradually and predictably
What is a period?
100
group 1; silvery solids; low melting points
What are alkali metals?
100
a substance that can make something faster but is not changed itself
What is a catalyst?
100
the first element
What is hydrogen?
100
4.5 billion years
What is the half life of uranium?
200
contains elements that have similar physical or chemical properties
What is a group
200
group2; reactive
What are alkaline earth metals?
200
1st series of innner transition elements?
What are lanthanides?
200
elements in iron triad
What is iron, cobalt, and nickel?
200
What is group 1 called
What are the alkali metals
300
groups 1,2,13-18
What are representative elements
300
doesn't conduct electricity as well as a metal
What is a semiconductor?
300
2nd series of inner transition elements
What are actinides?
300
the number of groups
What is 18?
300
What is the trend on the periodic table of least metallic to most metallic?
What is top right to bottom left?
400
Groups 3-12; all metals
What is transition elements
400
"salt-former"
What are halogens?
400
made in labratories and nuclear reactors
What is synthetic elements?
400
the number pf periods
What is 7?
400
how Mendeleev arranged his periodic table
What is increasing by atomic mass?
500
usually gasses or brittle solids at room temperatures; poor conductors of heat and electricity
What are nonmetals?
500
group 18
What are noble gasses?
500
Scientifically speaking what is 1.2x10^1 divided by 0?
What is undefined
500
54th element
What is Xenon?
500
how Mosley arranged his periodic table
What is by increasing by atomic number?
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