sample questions 1.3

(answers are at the bottom)

1. If you have two atoms with the same number of protons, what can you know about those atoms?

2. Now, if those same two atoms have a different number of neutrons than each other, what do we call them?

3. Why do atomic weights have decimal points?

4. What does the term “amu” mean?

5. What is an atomic mass unit?

6. How many amu’s are there in Cobalt? (use either of the following representations):
cobalt                               cobalt 2



1. they are the exact same element.

2. they are isotopes of each other. Remember, they have the same number of protons and therefore they are the same element. But because they differ in how many neutrons they have, they are isotopes of the same element.

3. Because the atomic weight is derived from the average number of neutrons that present in a type of atom added to the number of protons.

4. “Amu” stands for “atomic mass unit.”

5. The atomic mass unit is how we measure atomic weight. Remember that each proton and each neutron in a nucleus is worth one atomic mass unit (amu). And because the atomic weight is the sum of all protons and neutrons, it is the same as the sum of amu’s in an atom.

6. There are 59 atomic mass units (amu) in cobalt.



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