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Vocab questions

chapter 17 vocab into questions

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
Created by: nitaliano