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Jonata Science
Jonata 8th Grade Chapter Twelve
| definition | term |
|---|---|
| the smallest particle into which an element can be divided and still retain all of the properties of that element | atom |
| a unifying explanation for a broad range of hypothesis and observations that have been supported by testing | theory |
| the negatively charged particles found in all atoms, these are invovled in the formation of chemical bonds | electrons |
| a representation of an object or system | model |
| the tiny extremely dense positively charged region in the center of an atom; made up of protons and neutrons | nucleus |
| the regions inside an atom where electrons are likely to be found | electron clouds |
| the positively charged particles of the nucleus; the number of these in a nucleus is the atomic number | protons |
| the SI unit used to express the masses of particles in atoms | atomic mass unit (amu) |
| the particles of the nucleus that have no charge | neutrons |
| the number of protons in the nucleus of an atom; all atoms of an element have the same___________ | atomic number |
| atoms that have the same number of protons but have different numbers of neutrons | isotopes |
| the sum of the protons and neutrons in an atom | mass number |
| the weighted average of the masses of all the naturally occuring isotopes of an element | atomic mass |
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nmccaul
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