false all element when they are combined eachother thier valance number will change
the combination of oxygen and aluminum gives us Al2O3 see even the numbers are changing thank you if you have a comment you can write
it is B because i am big brain.
Answer: nS²
Answer: According to the periodic law, elements that fall into the same group have similar properties.
All the alkaline earth metals are in group two of the periodic table. The have 2 electrons in their outermost shell. In the SPDF electronic configuration the ground state of all alkaline earth have S² two electrons in their outermost S sublevel.
Example the electronic configuration of some alkaline earth metals are
Beryllium [He] 2S²
Magnesium is [Ne] 3S² and
Calcium is [Ar] 4S²
the general electronic configuration for alkaline earth metals is nS²
C. 4.5 kilometers. This answer will represent 9 divided by a half which will be 4.5