The table of the elements is said to be periodic because... 2 points
The elements are put in numerical order according to the number of protons.
The number of energy levels or electron shells increases according to period number.
The properties of the elements repeat themselves according to a regular repeating
pattern
The number of valence electrons is reflected in the family number

the correct answer: the index of refraction of the second medium is lower i tried this persons answer and it was wrong this person is lying

not sure if this what   you'r looking for would be percent composition

regents of the university of california v. bakke, 438 u.s. 265 (1978), was a landmark decision by the supreme court of the united states. it upheld affirmative action, allowing race to be one of several factors in college admission policy.