MCQEasy1 mark
1
Choose the correct answers to the questions from the given options. (Do not copy the questions, write the correct answers only.)
An atom of lithium contains 3 electrons, 3 protons and 4 neutrons. Its mass number is: (a) 3 (b) 4 (c) 7 (d) 10
Topic: Mass number
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Pick an option and check your answer. The full worked answer is below either way.
Answer
Exam answer
(c) 7.
Explanation
Mass number = number of protons + number of neutrons = 3 + 4 = 7.
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