Which of the following structures of sulfur is composed of crown-shaped S₈ rings at 25°C?

Which compound, SiF₄ or GeF₄, has more ionic character?

Which of the following molecules is polar and contains a main-group element that violates the octet rule?

Consider the elements of group 6A. Identify the element that forms the strongest π bond.

Which of the following statements is true about the properties of ammonia and phosphine?

I. Ammonia is trigonal planar, while phosphine is trigonal pyramidal.

II. Ammonia is a good proton acceptor, while phosphine is not.

III. Ammonia cannot exhibit hydrogen bonds, while phosphine can.

IV. At room temperature, both ammonia and phosphine are colorless gases.

What is the tetrahedron-based shorthand notation for the silicate anion in Na₉Si₃O₁₀? What is the relationship between the number of terminal O atoms and the charge of an anion?

Consider the elements listed in the periodic table:

The binary bromides formed by these elements in their highest oxidation state could have one of the following structures:

Identify the nonbromine atom and molecular formula in each possible structure.