The mass number of an element is equivalent to the number of Protons and Neutrons in the element. For example Oxygen has eight protons and neutrons, therefore its mass number is 16. You could also calculate this by simply rounding the atomic weight of the element to the nearest whole number. Oxygen's atomic weight is 15.994, which as you can see, would be rounded to 16 :)
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option a, she refused to remove to the train car designed for african Americans.
<span>location of water has been most responsible for the population distribution in the middle east</span>
The capital of irap is baghdad
