Write a ground state electron configuration for these ions. remember that ions have a
change in the total number of electrons (positive have lost electrons and negative have
gained). example: n3.is 1s 2s 2p. it has three extra electrons
11. 02-
13. b3+
15. k
12. fe2+
14. ni2+
16. co3+
17. if each orbital can hold a maximum of two electrons, how many electrons can each of the
following hold?
a. 2s
c. 4f
e. 4d
b. 5p
d. 3d
18) isoelectronic species have similar electron configurations. which of these are isoelectronic?
a) li*, h, he
b) ca2+, ne, s?

Answer(true);

Vander waals forces are inter molecular bonds that exist within molecules of the same substance. a water molecule is made up of oxygen and hydrogen atoms which share electrons between each other. the vander waals forces are forces that exist between multitude of different  molecules of water. dipole dipole forces is the type of vander waals force that exist in water. the oxygen atom which is more electronegative pulls the shared electron closer to itself thus generating a partial negative charge while the hydrogen acquire a partial positive charge. these two different charges causes attraction to occur in water molecules.