Elements d, e, and g have atomic numbers z, z+1, and z+2 respectively. e is a noble gas (not helium). which statement is true?
elements d and g should form a compound which is a gas at room temperature and which has formula gd.
elements d and g should form a compound which is a solid at room temperature with formula gd.
elements d and g should not react with each other.
elements d and g should react to form a covalent compound with formula dg7.
none of the above is a true statement.

which of the following ionic crystals would you expect to have the lowest melting point?
kf
kbr
cao
pbs
scn