There are 118 known elements. How many elements have atoms, in their ground-state, with core electrons whose quantum numbers are n = 3 and l = 1?.

Which of the following statements is not true? • a. covalent compounds have low melting and boiling points. • ob. covalent bonds between atoms of a compound are relatively weak compared to bonds between molecules. • c. covalent bonds occur between nonmetals. • d. covalent compounds are often gases or liquids.

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Asubstance is a good conductor of electricity which of the following best explains a probable position of the substance in a periodic table