Ga
Br
O
Sr
Cl
O
Explanation:
Electronegativity of an element is a property that combines the ability of its atom to lose and gain electrons.
It is measured as the relative tendency with which atoms of the element attracts valence electrons in a chemical bond.
- Across a period, electronegativity increases from left to right.
- Down a group, it decreases:
Ca or Ga: from group II to group III, so Ga is higher
Br or As: from group V to group VII, so As is higher
Li or O: from group I to group VI, so O is higher
Ba or Sr; down a group II, so Sr is higher
Cl or S: from group VI to group VII, so Cl is higher
O or S; down a group VI, so O is higher
Learn more:
Periodic trends brainly.com/question/5795638
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