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Science Chapter 4
Study Guide- Lesson 1&2
| Question | Answer |
|---|---|
| the basic particle from which all elements are made; the smallest particle of an element that has the properties of that element | atom |
| tiny, negatively charged particle that moves around the outside of the nucleus of an atom | electron |
| the central core of an atom which contains protons and neutrons | nucleus |
| small, positively charged particles that are found in the nucleus of an atom | proton |
| a region of an atom in which electrons of the same energy are likely to be found | energy level |
| a small particle found in the nucleus of an atom with no electric charge | neutron |
| the number of protons in the nucleus | atomic number |
| an atom with same number of protons and different number of neutrons from other atoms of the same element | isotope |
| the sum of protons and neutrons in the nucleus of an atom | mass number |
| the average mass of all the isotope of an element | atomic mass |
| an arrangement of the elements showing the repeating pattern of their properties | periodic table |
| one or two letter representation of an element | chemical symbol |
| a horizontal row of elements in the periodic table | period |
| elements in the same vertical column of the periodic table; also called families | group |
| Who created the first version of the periodic table? | Dimitri Mendeleev |
| What are the three major groups on the periodic table? | metals, nonmetals, and metalloids |
| How do you find the number of neutrons in the nucleus of an atom? | 1st- round the atomic mass to a whole number 2nd- subtract the atomic number from the mass |
| What tells you the number of protons and electrons? | atomic number |
| How many electrons can each shell hold? | 1st- 2 2nd- 8 3rd- 18 or 8 4th- 32 |
| If an element is in the 2nd period, how many shells will it have? | 2 |
| If an element is in the 5th group, how many valence electrons will it have? | 5 |
Created by:
southern_flair
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