Environmental Chemistry: Boiling Point

BOILING POINT G1
Decreases going down. Because metal bonds get weaker. Less energy is required this metallic bonding.
BOILING POINT G 17,18
Increases. Because the atomic size incrases. The molecules are attracted by intermolecular forces. Going down the group, the intermolecular forces increases. More energy is needed to overcome these stronger forces.
DENSITY
Because mass increases faster than volume.
REACTIVITY OF GROUP 1
The number of occupied shells increases. The atomic size increases. The valence gets further away from the nucleus.
The strength of attraction from the nucleus to the valence electron gets weaker.
The valence electron is loosely held and it is easy for the elctron to be released to form stable octet lectron arrangement.
The reactivity of G1 is the tendency of the atom to release elctron to form stable electron arrangement. The easierm the atom releases electron, the more reactive it is.
ELECTROPOSITIVITY
The electropositivity of G1 is the tendency of the atom to release electron to form stable electron arrangement.
As the size increases going down the group, the valence gets further away from the nucleus. The strength of attraction from the nucleus to the valence electron gets weaker.
CHARACTERISTICS OF G1
Shiny surface, grey solid, insoluble in water, (softer, less dense, low points)compared to other metals
REACTIVITY OF GROUP 17
The number of occupied shells increases. The atomic size increases. The outer occupied shell becomes further away from the nucleus.
The strength of attraction from the proton in the nucleus to attract one valence elctron into the outermost occupied shell becomes waker.
The tendency to receive elctron decreases..
The reactivity of G17 is the tendency of the atom to receive elctron to form stable electron arrangement. The easier the atom receives electron, the more reactive it is.
ELECRONEGATIVITY DCREASES ACROSS PERIOD
The proton number increases by one unit across the period.
Increase in proton number causes the number of positive charge in the nucleus increases.
The strength of attraction from the proton in the nucleus to the electron increases. size of atom decreases
This is due to the pulling force exerted from the nucleus towards the electron.