If an element is located in group 14 of the periodic table, which of the following statement(s) can you conclude about the atoms of this element? A It has four valence electrons.

B It has four energy levels.

C It has four core electrons.

D It has properties similar to carbon.

What does a particular point on a line of a phase diagram represent? o a. the maximum temperature a substance can exist at without bonds breaking b. the pressure created by the kinetic energy of molecules at a particular temperature c. the melting point or boiling point of a substance at a specific pressure d. the conditions in which temperature and pressure have equal effects on a substance

1. list three scientific reasons cockroaches may fly.

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms