periodic table Flashcards
(13 cards)
humphry davy discovery
elements potassium calcium strontium
atomic number
number of protons in an element
no two elemens have the same
atomic number
dobreiner triad example
Cu: copper
Ag: silver
Au: gold
a triad is three elements in order of
atomic mass
newlands octaves
a group of elements arranged in order of increasing atomic weight, where the first and eight element have similar properties
newlands octaves probloms
- only worked on first 16 elements
- not all elements were discovered
periodic law
properties of elements arranged in order of increasing atomic mass, vary periodically
difference between mendeleev and newland
- mendeleev left empty space for new elemnts to be discovered
- mendeleev reversed orders of elements to make them fall into similar groups
mendeleev reverse order example
iondine
flourine
cholrine
bromine
what did moseley study
frequencies of x-rays emitted by atoms
modern periodic table arrangment
is arranged according to increasing atomic number