An element has two isotopes. one has a mass of 5.03 amu and an abundance of 25%, the other has a mass of 7.20 amu and an
abundance of 75%. what is the average atomic mass of the element?

Read the sentences below in 1962, i tried to enroll as the first black student at the university of mississippi. the governor of mississippi blocked my entrance which best describes the verbs used in the sentences? o they are past tense verbs, which are often used in narrative essays o they are past tense verbs, which are not often used in narrative essays. o they are future tense verbs, which are often used in narrative essays o they are future tense verbs, which are not often used in narrative essays.