The last question i
write the product concentration expression for the decomposition of ammonia to hydrogen and nitrogen. ( use as much detail/ work when answering ).

it's c. elements are placed in rows based on how may valencies electrons have.

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.