How well can you use your Periodic Table? Which element is in period 2. group 18?
Which element is in period 4. group 2?
Which element is in period 3, group 16
How many protons does an elements atom have that is located in period 4, group 5

no one knows lol

step-by-step explanation:

twenty-six miles over two gallons because the proportion for the original 13 miles to one gallon would be written 13/1 and, doing the same thing to the top and bottom, i multiplied by 2 and got 26/2

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step-by-step explanation:

this is a parabola.