Elements are placed into the same period on the periodic table of the elements because they a. form the same type of chemical bonds. b. have the same number of electron energy levels. c. form the same type of isotopes. d. have the same chemical properties.

the answer is

B. have the same number of electron energy levels.

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there are 35 white marbles

step-by-step explanation:

y- yellow marbles

4y + 5 = 45

subtract 5 from both sides

4y = 40

divide for from both sides

y = 10

plug in 10 to get 40 yellow marbles then subtract by 5 to get 35 marbles

thus there are only 10 yellow marbles