1. 26 + 2.001 =
28.0 28.00 28.001 28 All of these

2. How many protons in sodium-23?
11 12 23 1 0

3. How many neutrons in carbon-13?
13 0 1 7 6

4. How many significant figures: 26.2 + 100.
Answer:

5. How many electrons in boron-11?
11 5 6 10 None of these

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