To calculate the average mass of the element, we take the summation of the product of the isotope and the percent abundance. In this case, it is 0.935 * 268.9 amu + 0.065* 269.9 amu. This is equal to an average mass of 268.965 amu.
all but energy i think but if not its a and d
Explanation:
Answer to the question
D. Petroleum
Answer:
When excited electrons fall to lower energy levels, they can release energy in the form of light. metal ions in the salts used in the flame tests.
