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all about elements
chapter 17 & 18 vocabulary
Term | Definition |
---|---|
element- | a pure substance made from only one kind of atom |
how many naturally occurring elements? | 92 |
list of diatomic elements- | H, N, O, Cl, Br, I |
diatomic element- | 2 atoms in natural state |
monotomic element- | 1 atom in natural state |
Dimiti Mendeleev- | arrange the elements into the periodic chart |
periodicity- | repetition of atoms' properties when elements are listed in order of atomic mass |
octaves- | when arranged in 7 columns, every 8th element has similar properties |
periodic law of elements- | element properties occur in an orderly fashion when the elements are arrange by atomic # |
caTions- | atoms with posTive charges (+) |
aNions- | atoms with Negative charges (-) |
Johann Dobereiner- | arranged elements into "triads" |
John Newlands- | arranged elements into "octaves" |
electron affinity- | an attraction to UNBONDED ATOMS |
electronegativity- | an attraction to BONDED ATOMS |
ionic bond- | metal + nonmetal |
covalent bond- | nonmetal +nonmetal |
metallic bond- | metal + metal |
ionic bonds _________ electrons | ttransfer |
covalent bonds _______________ electrons | share |
metallic bonds have an "__________ ___________" (aka electron socialism) | **electron sea** |
francium- | weakest element |
flourine- | strongest element |
inert- | does not react/ un-reactive |
"the ____________ # tells you how many electron levels that there are" | period |
"the ____________ # tells you how many electron are in the atoms outer shell" | group |