The answer is Br> Ge > Ca > K .
Electronegativity is the tendency of atom to attract an electron towards itself.
What is the trend of electronegativity in a periodic table?
- Electronegativity increases from left to right and decreases from top to bottom in a periodic table.
- Metals are on the left side of the periodic table, they have low electronegativity while non-metals are on right side of the periodic table with higher electronegativity.
- Now, Ge is Germanium is a non-metal (group 14) and lies on the right side of the periodic table.
- Ca is Calcium and it is a metal placed in group 2.
- Br is bromine which is a non-metal placed in group 17.
- K is potassium which is a group 1 metal.
- Now, we have two metals and two non-metals. As the group number increases, electronegativity increases (from left to right).
- Hence, the given elements are arranged in order most to least electronegative as- Br> Ge > Ca > K
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