An atom has a mass number of 19 and an atomic number of 9. What element is it? What is its symbol? How many protons, neutrons, and
electrons does it have?

Fluorine, it has 9 protons, 9 electrons, and 10 neutrons.

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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.