How do you think the bonds between carbon atoms might be different in diamond and graphite? What other kinds of allotropes are there? What kinds of properties and atomic bonds do they have?

the answer is barium and copper bromide

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.