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CHCS 6th 5
CHCS 6th Grade Science Chapter 5
Question | Answer |
---|---|
Atoms | the building blocks of all matter; made up of protons, neutrons, and elections |
element | a pure substance; all atoms have the same atomic number |
nucleus | the center of an atom; contains the protons and the neutrons |
proton | particle that has a positive charge |
neutron | particle that has no charge, or is neutral |
electron | a particle that has a negative charge |
strong force | this holds the nucleus together, keeping the protons and neutrons together |
atomic number | tells the number of protons and the number of electrons found in an element |
atomic mass | the mass of an atom; tells how many protons plus how many neutrons are in an element |
shells | energy levels where electrons can be found circling the nucleus |
valence electron | the electrons in the outer most shell of an atom |
periodic table | a chart that arranges elements into groups by their properties |
electron energy levels | another name for electron shells; energy levels where electrons can be found circling the nucleus |
period | a horizontal row of the periodic table; tells how many shells an element has |
chemical family | a group of elements that have similar properties; vertical columns on the periodic table; tells how many valence electrons each element has |
groups | another name for chemical family; a group of elements that have similar properties; vertical columns on the periodic table; tells how many valence electrons each element has |
metal | an element that usually has one, two, or three valence electrons and that is typically shiny, hard, and a good conductor of heat and electricity |
nonmetal | an element that usually has five, six, or seven valence electrons and that is typically dull, brittle, and a poor conductor of heat and electricity |
Lewis dot structures | a figure in which dots around and element's symbol represent valence electrons; also called an electron dot diagram |