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

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"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

just did the assignment and the answer was #1 +2 n

that's what i got you can count the number of atoms