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Mini-Quiz: Chemical Elements

by Ron Kurtus (revised 16 September 2015)

Take this Mini-Quiz to check your understanding of the lesson material.

1. What does the atomic number designate?

An alphabetical ranking

The number of protons in the nucleus

The number of protons and neutrons in the nucleus

2. If the average atomic weight of atomic number 11 (Sodium) is 22.989770, how many neutrons are in its most common isotope?

Round off 22.989770 to get 23 and add 11 to get 34

Round off 22.989770 to get 23 and subtract 11 to get 12

Round off 22.989770 to get 22 and divide by 11 to get 2

3. Why are the atomic weights of the unstable elements whole numbers?

It is just an approximation, because measurements could not be made

They are the few elements with an exact atomic weight

They are so unstable that the decimals simply fell off

If you got all three correct, you are on your way to becoming a Champion in Chemistry. If you had problems, you had better look over the material again.

The solution is elementary

Resources and references

Ron Kurtus' Credentials


Chemical Elements - Site with details on Periodic Table

Chemistry Resources


Top-rated books on Chemistry

Top-rated books on Physics

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