Chemistry 2.5 Group 7-The Halogens Flashcards
what happens to reactivity going down group 7
the elements get less reactive.
why does the reactivity go down the further down the group you go
as you go down, there is a weaker attraction from the nucleus to gain an electron as there is a bigger distance from the nucleus to the outer shell.
what else increases as you go down group 7
the melting and boiling points of the elements and the relative atomic masses.
what is another name for the group 7 elements
the halogens.
what do the halogens exist as
diatomic molecules.
how can halogens share electrons to gain a full outer shell
covalent bonding with a non-metal
what is it called when a halogen gain an electron
halide ions (1-)
what are group 0 elements called
noble gases
what is special about noble gases
they have full outer shells making them very stable.
what is this stability called
being inert
what does the fact that the noble gases are inert mean
they don’t burn (non-flammable)
what do they exist as at room temperature
colourless, monatomic gases
what are some trends in group 0
the boiling points increase down the group, the atomic mass increases down the group and the atomic number increases and the number of electrons increase down the group.
what are some uses for noble gases
neon signs (neon), stopping liquid metal from reacting in air (argon) and helping people with breathing difficulties breath more easily (helium)
