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Vocab questions
chapter 17 vocab into questions
| Question | Answer |
|---|---|
| Does the atomic number equal the same number of protons in a nucleus? | yes, The atomic number, number of protons, and electrons are all the same in a nuetral atom. |
| How do you find out the mass number? | you add up the number of protons and nuetrons in the nucleus to get the mass of the atom. |
| What is an ION? Does it have a negative charge or a positive charge? | an ION is when the elctrons on the outer shell gain or loose some from another atom. To see if the ION is negative or positive, you must compare the protons (+) and the electrons (-). |
| How do you know if the ION is positive or negative? | If there are more electrons (-) than protons the ION is negatively charged. If there are more protons (+) than electrons the ION is positive. |
| What are the outer layers of the nucleus called? | the outer layers are called concentric shells. |
| How many electrons (-) can a concentric shell hold? | in the first shell it can hold two electrons. in the second, 8.. In the third it can hold no more than eight. |
| What are isotopes? | isotopes are when it has the same atomic number of the regular atom, but a different mass number. |
| What is the difference of molecuels and atoms? | Atoms are single pieces and molecues have one or more atoms in them. |
| How do you know if something is a compound? | If it has a formula it is a compound. |
| What is the building blocks of matter? | atoms |
| how many elements are there? | just about 117 |
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