Because in SI, the expectation is that area and volume will be expressed in terms of a linear dimension( the metre) or its multiples.
C. Magnesium and Calcium is my best guess because they are in the same group or family and they are in the <span>alkaline earth metals.</span>
When it switches to a lower orbital, the atom emits energy in the form of photons. Your answer is C.
Answer:
sodium, Na
Explanation:
Na, is the smallest with atomic number 11 and it has one valence electron