Group 17 elements are called halogens because most them are
salts
one electron short of octet configuration
constituents of salt
exist in sea water
Which is a relatively rare element in earth’s crust among the following?
Thallium
Indium
Boron
Gallium
Electronic confguratiion of group 18 elements?
ns2np4
ns2np3
ns2np5
ns2np6
