Properties of Elements Flashcards
Li in
akali metals
Be in
akaline earth metals
Sc to Zn in
transition metals
grey “staircase”
metalloids
Al to Po in
post-transition metals
C to I in
non metals
He in
noble gases
La in
lanthinides
Ac
actinides
periodic table down
groups
periodic table across
periods
periodicity
regular repeating pattern of properties
jw dobreiner
law of triads:
- link b/w atomic weight and properties in groups of 3s
problem:
- could only identify a small # of triads
jar newlands
law of octaves:
- properties are repeated in octaves of 7 elements when arranged in increasing atomic mass
problem:
- didn’t show properties after calcium
- no space for new elements
lother meyer
properties:
- organized families of valence e-
problem:
- no space for new elements
- didn’t use all the elements
dmitri mendeleev
the periodic law:
- atoms organized by atomic mass
- names groups and periods
- left spaces for unknown elements
problem:
- no fixed position for H
- No noble gases
William ramsay
noble gases:
- found noble gases
henry moseley
modern periodic table
- addressed mendeleev’s discrepancies
glenn seaborg
rare earth elements:
- lanthinides/actindes added
- idea of a 3d model
info from periodic table
study
matter
takes up mass and has space
pur substance
only one type of matter (element or compound)
element
one type of atom (ex. Mg, H2, O2)
compound
more than one type of atom (H2O, HCl)
