Look at the location of elements A,B,C,and D in the following periodic table.Consider the oxides that form when the elements A-D are in their highest oxidation states. 
-Which oxide is the most covalent?
Definitions:
Evaluation Apprehension
The fear of being judged or evaluated by others, which can influence individuals' performance and behavior in social situations.
Self-esteem
The evaluative component of the self-concept. The positive and negative evaluations people have of themselves.
Dissimilar
Not alike or similar; having differences that distinguish one thing or person from another.
Empathy-altruism Hypothesis
The idea that empathic concern for another person creates a genuine selfless motivation to help that individual.
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