Cobalt is element 27. Cobalt-60 is used in the medical treatment of cancer. How many neutrons and protons are contained in the nucleus of this isotope?

Of the elements: B, C, F, Li, and Na. The element with the highest ionization energy is

The total number of electrons to be counted for the Lewis structure of the PO43- polyatomic ion is:

A bond where the electrons are shared equally is called:

Of the elements: B, C, F, Li, and Na. The element with the highest ionization energy is

Predict the number of valence electrons for a sulfur atom.

Formaldehyde is a covalent compound used as a preservative for biological specimens.  Which statement concerning the Lewis structure of formaldehyde, shown below, is FALSE?        :O:        ||H – C – H

The total number of electrons to be counted for the Lewis structure of the PO43- polyatomic ion is:

Identify the major type of intermolecular forces  between molecules of HCl.

The element which has four valence electrons is ________.