Answer:
A pair of elements will most likely form an ionic bond if one is a metal and one is a nonmetal. These types of ionic compounds are composed of monatomic cations and anions.
Avogadro's number; it describes the number of representative particles in one mole of a substance. Avogadro's number is. 6.022×10^23mol
Answer is 5A or VA. remember each group represents how many valence electron an atom have.
The answer is stars, It has enough gas and dust to make billions of more stars.
Hope that helps :D
I think the correct answer would be the first option. Scientists need scientific models because they can often be used to make predictions. Models are representation of a process, natural phenomenon, or an idea that is being used to describe and define the occurrence which cannot be seen directly. These are very useful tools in order to predict certain values that would be tedious to be obtain through experiment. Also, this would help scientists to obtain values that is outside the range of their experiment. Examples of these models are the models of the motions of the earth, sun and the moon.<span />