Question

fill in the blanks in each of the following sentences using the verb in parenthses in past progressive present progressive,or future progressive tense.? ____ we ____ ____ through passport control after we land?(go)
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Answer 1

Answer:

Isotopes are atoms of the same element with different numbers of neutrons. Because they contain different numbers of neutrons, isotopes have different atomic masses. The average atomic mass of an element is calculated by taking the weighted average mass of the element's naturally occurring isotopes.

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