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what is an element?
a substance that conatins only one kind of matter. Makes up all matter, all atoms are identicle
what is a chemical symbol and how is it written?
an abreviation of the element. It is written by the first letter being uppercase and all of the other letters are lowercase.
what is the periodic table of elements?
an organization of all the known elements. Visually organizes the characterists of the elements
who developed the first periodic table?
what info does an element's atomic # indicate?
how many nuetrons the atom has
what info does the atomic mass indicate about the element?
it is the average of the number of isotopes
How is the number on nuetrons in an atom found?
atomic mass- atomic number
what is an isotope?
forms of the same element that have different number of nuetrons and atomic masses
what are the rows in the periodic table called? what info do they give? how many are there?
period, tells how many energy levels, there are 7
how can the number of electrons of an atom determined?
same as proton, atomic number
what are valence electrons?
electrons that are involved in chemical bonds, on outermost energy level.
what are the colums in the periodic table called? what infodo they give? how many are there?
they go up and down, tell how many valence electrons there are, there are 18/8
in what numerical order are elements listed in the periodic table?
small to big, left to right by atomic number. Also organized by atomic mass.
what are the three major divisions of the periodic table?
metals, nonmetals and metalloids
what are the seven sections of the periodic table?
rare earth metals, halogens, transition metals, noble gases, alkaline metals, alkali metals, metalloids
- go through 3/13- 7/17
- 3456 are possible valence electrons
- sometimes act like a metal sometimes don't
- sort of want to bond
- seperate metals and nonmetals on table in zig zag pattern
- are in group 1 and have one valence electron
- ingnite in water
- bonds with halogens because they have 7
- are in group 2 and have 2 valence electrons
- considered party group
- slightly less reactive than alkali
rare earth metals
- some are man made, some are from nature
- bottom 2 rows on table
- many are radioactive
- some are used in nuclear power
- used in everyday life
- 2-4 electrons
- don't follow the group familly rule
- most reactive on non metals
- bond easily with alkali
- used in cleaning
- dull brittle not conductor
- have 8 valence electrons
- have to zap with electrictiy to get to do anything