How does a trigonal pyramid differ from a tetrahedron so far as molecular geometry is concerned? bond angles in the tetrahedral molecule are 120°, while those for trigonal pyramid are 109.5° a trigonal pyramid is a tetrahedron with two vacant vertex. a trigonal pyramid is a tetrahedron with one vacant vertex. bond angles in the tetrahedral molecule are 109.5°, while those for trigonal pyramid are 120° a tetrahedron has a square base, while the base of a trigonal pyramid is a triangle.

The grooves or folds of the brain are called

The table lists the lattice energies of some compounds. compoundlattice energy (kj/mol)lif            –1,036licl            –853naf            –923kf            –821nacl            –786which statement about crystal lattice energy is  best  supported by the information in the table? the lattice energy increases as cations get smaller, as shown by lif and kf. the lattice energy increases as the cations get larger, as shown by lif and licl. the lattice energy decreases as cations get smaller, as shown by nacl and naf. the lattice energy decreases as the cations get smaller, as shown by naf and kf.

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver