Studied by 26 peoplewhat did Newlands find in 1864
that properties of elements repeat every 8th element
what was Newlands finding named
the law of octaves
why was Newlands’ findings not accepted
they weren’t seen as professional because of the music analogy
what did Mendeleev form in 1869
the first periodic table
where was Mendeleev from
russia
where was Meyer from
germany
what was unique about the first periodic table
it had blank spots left for new elements
what did Mendeleev do with the undiscovered elements
predicted their properties
why was Mendeleev’s table used more than Meyer’s
Mendeleev posted his results first
what was wrong with mendeleevs table
it was sorted by atomic mass
who corrected Mendeleev’s mistakes in 1913
Henry Mosley
what was Mosley’s revision
arranging the elements by atomic number instead of mass
what does periodic mean
repetition in a specific manner
what is the row called
a period
what do periods sort elements by
energy levels
what is the columns called
groups or families
what do groups sort elements by
similar properties and by valence electrons
how many groups
18
how many periods
7
what are the group one elements called
alkali metals
what are the group two elements called
alkali earth metals
what are the groups 3-12 elements called
transition metals
what are group 16 elements called
chalcogens
what are group 17 elements called
halogens
what are group 18 elements called
noble gasses
what one element is in group one but not apart of the alkali metals
hydrogen
what are the bottom two rows called
inner transition metals
what is the first row at the bottom called
lanthanoid
what is the second row at the bottom called
actinoid
what elements border the stair step
metalloids
what element borders the stair step but isn’t a metalloid
aluminum
name three properties of metals
malleable, has luster, and is a good conductor
name three properties of nonmetals
brittle, insulators, is dull
do metals lose or gain electrons
lose
do nonmetals lose or gain electrons
gain
what is the most active metal
francium
what is the most active nonmetal
fluorine
what are alkali metals
the most active metal group
what is the most active nonmetal group
halogens
what is the octet rule
an atom that has 8 valence electrons will be considered full and stable
what is special stability
an atom with a full or half full sub level is more stable
what does special stability apply to
d and f sublevels
what are the elements on the right side of the stair step
nonmetals
what year did newlands discover the law
1864
what year did the first periodic table get made
1869
what year did Mosley revise the periodic table
1913
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Flashcard (74)