The molecular geometry of the PF3 molecule is ________, and this molecule is ________ (polar or nonpolar).

There are ________ σ bonds and ________ π bonds in H3C-CH2-CHCH-CH2-CCH. (This question is asking for numerical answers.)

Consider the following species when answering the following questions: (i) BCl3 (ii) CCl4 (iii) TeCl4 (iv) XeF4 (v) SF6 Which of the molecules has a see-saw shape? 

Which of the following does not have eight valence electrons?

What is the maximum number of double bonds that a hydrogen atom can form?

The hybridizations of nitrogen in NF3 and NH3 are ________ and ________, respectively.

For a given arrangement of ions, the lattice energy increases as ionic radius ________ and as ionic charge ________.

What is the hybridization of the carbon atom attached to the two oxygen atoms in the structure below? 

In the Lewis structure shown here, A, D, E, Q, X, and Z represent elements in the first two rows of the periodic table. Identify all six elements so that the formal charges of all atoms are zero. 

What is the electron configuration for the Co2+ ion?