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all about elements

chapter 17 & 18 vocabulary

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
Created by: rosies