Answer:
0001 M HCl is the same as saying that 1 *10-4 moles of H+ ions have been added to solution. The -log[. 0001] =4, so the pH of the solution =4
The answer is B. two chlorine atoms.
The chemical formula of the compound is BaCl2~
It is in Group 5A => <u>5</u> valence electrons