Concept:Metallic character increases down a group because atomic size increases, making it easier to lose electrons.
Explanation:Li,
Na, and
K are all alkali metals in Group 1 of the periodic table.
Moving from
Li to
K, each element has one more electron shell.
A larger atomic size means the outermost electron is farther from the nucleus and held less tightly.
Hence, the tendency to lose electrons and show metallic property increases as we go down the group.
Therefore, the correct increasing order of metallic property is:
Li<Na<KThis arrangement is given in option A.
Answer:A.
Li<Na<K