Problem: A compound ACl3 (A is an element) has a melting point of -112 °C. Would you expect the compound to be molecular or ionic? If you were told that A is either scandium or phosphorus, which do you think is the more likely choice?

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A compound ACl3 (A is an element) has a melting point of -112 °C. 

Would you expect the compound to be molecular or ionic? 

If you were told that A is either scandium or phosphorus, which do you think is the more likely choice?

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