Group VII elements are strong non-metals because they can easily accept an electron to form an anion whereas group I elements are strong metals because they can very easily lose one electron to form a cation. Metals have the tendency to lose their valence electrons and form positive ions, so metallic character is related to the ionization potential. Elements having low ionization potential, lose easily. Thus, a metallic character generally decreases across a period and increases down a group.
Which of the following is the correct decreasing order of metallic character?

Ca > Sc > Ti > K

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K > Ca > Sc > Ti

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K > Sc > Ca > Ti

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Ti > Sc > Ca > k

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Solution

The correct option is B
K > Ca > Sc > Ti

Explanation for the correct option -
(B) Metallic character: An element tends to lose electrons and form positive ions or cations.
Metallic character decreases as we move across a period from left to right because the size of the atom decreases across a period due to this the nucleus attracts the valence electrons more strongly. So, it becomes difficult to lose an electron.
K(potassium) is present on the extreme left side of the periodic table, Ca(calcium) is placed after potassium(K), Sc(scandium) is placed after Ca, and Ti(titanium) is placed at the rightmost side among these 4 elements.
Thus, the decreasing order of metallic character is K > Ca > Sc > Ti. The given elements belong to the same period
Hence, option (B) is correct.

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233. Group VII elements are strong non-metals because they can easily accept an electron to form an anion whereas group I elements are strong metals because they can very easily lose one electron to form a cation. Metals have the tendency to lose their valence electrons and form positive ions, so metallic character is related to the ionization potential. Elements having low ionization potential, lose easily. Thus, a metallic character generally decreases across a period and increases down a group.

Group 1 and Group 2 elements are considered strong metals because

Assertion: Metallic characters of the elements increases down group while non-metallic character decreases.

Reason: Down the group electron releasing tendency of the element increases while their electron accepting tendency decreases.

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