Question

3 multiple choice 1 point an atom of lithium (li) has a mass number of 7 and an atomic number of 3. how many neutrons does it have? 10 4 3 7

Explanation:

Step1: Recall the formula

Number of neutrons = Mass number - Atomic number

Step2: Substitute values

Number of neutrons = 7 - 3

Step3: Calculate result

Number of neutrons = 4

Answer:

B. 4