Give TWO reasons, in terms of shielding, why potassium is the most reactive of the three elements.
(B) Iron, copper, chromium and manganese are a type of elements
known as transition metals.
State the difference between transition metals and alkali metals
in terms of the oxidation state of their ions formed.
Nitric acid is a strong acid that reacts with an alkali to give a salt an
non known as an acid-base reacti

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.