<span>The best answer is C. Alfred Wegener was convinced that all continents were once an enormous, single landmass which is call Pangaea. But it was also believed that it began to break into pieces that moved away from one another over 150 million years ago.</span>
The net ionic equation of the reaction could be determined by cancelling out the like ions between both sides of the reaction. These ions are called spectator ions. They are called as such because they do not actively participate in the reaction. The spectator ions are Na+ and Cl-. When you cancel those, the equation would become letter D.
Explanation:
Atomic mass = Number of neutrons + protons
= 12 + 11 = 23.
(Electrons are so light that they are considered to have negligible mass)
Through Periodic table, we can classify every existing element into a better way, so we can study about all of them, very shortly/easily (As most of the element, shows similar properties)!!
Hope this helps!
Hcl is an acid as it dissociates to donate a proton