Chapter 2 - The periodic table Flashcards
Which group are the noble gases?
group 0 - full outer shells so they’re unreactive and don’t form bonds
what do elements of the same group have in common?
the same number of electrons on their outer shell - giving them similar chemical properties
which group are the alkali metals?
group 1
which group are the halogens?
group 7
what do elements of the same period have in common?
the same number of shells
What did Newlands discover about the periodic table?
The law of octaves - he saw a pattern that every 8th element had similar properties so he started a new row giving the groups on the periodic table
what did Mendeleev discover about the periodic table?
he ordered the elements by atomic weight and started a new row when/if a characteristic was repeated
in what way was Mendeleev’s periodic table successful?
He left gaps for undiscovered elements
what happened to the reactivity in the elements of group 1?
increased
what happened to the melting/boiling point of group 1?
decreased
what happened to the reactivity in group 7?
decreased
what happened to the boiling point of group 7?
Increased
