The number of valence electrons in an atom can often be quickly determined by referencing a. the atomic mass of the element. b. the period number on the periodic table. c. the atomic number of the element. d. the group number on the periodic table.

The number of valence electrons in an atom can often be quickly determined by referencing: the group number on the periodic table.

answer: the figure is attached herewith.

step-by-step explanation:   we are given to sketch a unit circle and label the terminal points corresponding to

in the attached figure, we have drawn a unit circle, with centre at o(0,0) and radius 1 unit. we have labelled the points a, b, c, d and e corresponding to the angles below

∠aox = 60°,

∠box = 120°,

∠cox = 180°,

∠dox = 240°,

∠eox = 300°.

and the coordinates are a(0.5,1), b(-0.5,1), c(-1,0), d(-0.5,-1) and e(0.5,-1).

thus, the answer is complete.

chemistry sucks a**

explanation: