![Read more about the article Elements at the extreme left of the modern periodic table are …………… reactive, while elements on the extreme right [group 18 (0)] are …………… reactive [least/un/most].](/wp-content/uploads/2025/06/Flash-Education-Question-and-Answer-Icon.webp "Elements at the extreme left of the modern periodic table are ............... reactive, while elements on the extreme right [group 18 (0)] are ............... reactive [least/un/most]. 1"){kind=icon}
Elements at the extreme left of the modern periodic table are most reactive, while elements on the extreme right [group 18 (0)] are unreactive.
Across a period, the electropositive character decreases and down a group the electronegative character decreases.
Across a period the valence electrons increase by 1 while down a subgroup they remain same.
Periods are 7 horizontal rows of elements in the periodic table and an element with three electron shells and two electrons in it's valence shell belongs to period 3 and group 2.
'Y' with electronic configuration 2, 8, 6. Reason X will belong to group 15 and Y will belong to group 16 and as non-metallic increases across a period (i.e., from…
Cl (Chlorine) Reason As non-metallic character increases across a period (from left to right) and Ar is a noble gas hence Cl will have maximum non-metallic character as it lies…
F (Fluorine) Reason As non-metallic character increases across a period (from left to right) hence F will have maximum non-metallic character as it lies in group 17 in period-2
K (Potassium) Reason As metallic character increases down a group hence K will have maximum metallic character among the given elements.