Chapter 7 - Periodicity Flashcards
atomic number
(left to right)
it is arranged in order of increasing atomic numbers
every element has atoms with 1 extra electron (than the one before)
groups
each element in a group has the same number of outer-shell electrons and similar properties
periods and periodicity
the no. of period = number of highest energy electron shell in an element’s atom.
groups 1 and 2 are what block
s block
groups 3 - 12 are what block
d block
groups 15 - 18 are what block
p block
the bottom block is called
f block
what are group 1 called
alkali metals
what are group 2 called
alkaline earth metals
what are group 3-12 called
transition elements
what are group 15 called
pnictogens
what are group 16 called
chalogens
what are group 17 called
halogens
what are group 18 called
noble gases
what is first ionisation energy
the energy required to remove 1 electron from each atom in 1 mole of gaseous atoms of an element to form 1 mole of gaseous +1 ions.