The Ancient Greeks developed astronomy, which they treated as a branch of mathematics, to a highly sophisticated level. The first geometrical, three-dimensional models to explain the apparent motion of the planets were developed in the 4th century BC by Eudoxus of Cnidus and Callippus of Cyzicus.
Assuming you mean one valence electron, these are classified as alkali metals. Or in other words Group I or the first group going up and down vertically.
there needs to be more info
<span>The answer is C.
Outliers are data points that fall way off the average range of values in a dataset. In this case, the number 13 is way off from the
rest of the values which range between 4
and 7. An outlier may represent an error in an
experiment that involved many
treatments. </span>