Periodicity Flashcards
when is periodicity exhibited
.when there is a regular pattern i n property as you go across a period
.when the regular pattern is repeated in other periods
does IE exhibit periodicity
yes
what is the relationship of IE and periodicity
there is a general increase across a period
between which groups do you see a large decrease in ionisation energy?
Group 0 and 1
what factors affect ionisation across a period
nuclear charge and paired or unpaired electrons
how can you identify which group an element is depending on its IEs?
which ever IE has the biggest difference, determines which group its in
what are the three main periodic tables that are looked at?
Newlands, Mendeleev and Modern
how was Newlands PT ordered?
atomic mass
how was mendeleevs PT ordered?
atomic mass but some was switched
how is the modern periodic tale ordered?
atomic number
which PT had gaps
Mendeleevs
why did Mendeleev leave gaps
because he knew there are undiscovered elements and so with the predictions of the properties of the elements, he left the gaps accordingly
how was newlands PT grouped
it wasnt
how was mendeleevs PT grouped
elements were grouped according to chemical properties
how is the modern PT grouped
according to no of electrons in outer shell
