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Ch8Atoms/PeriodTable
8th grade science, periodic table, atoms
Question | Answer |
---|---|
negatively charged particle that orbits, moves around, the nucleus | electron |
substance that has only one type of atom | element |
the center of an atom | nucleus |
positively charged particle, found in the nucleus | proton |
a particle with no charge, found in the nucleus | neutron |
the number of protons (and electrons) in an atom | atomic number |
the number of protons and neutrons in an atom | atomic mass |
space where electrons are found | shell |
a horizontal row in the periodic table (running from side to side) | period |
a vertical column in the periodic table (running from top to bottom) | group |
shiny, good conductors of electricity and thermal energy | metal |
most reactive family of metals | alkali metals |
group 1 of the periodic table | alkali metals |
the russian chemist who first designed the periodic table | Ditri Mendeleev |
groups 3-12 of the periodic | transition metals |
group 18 of the periodic table | noble gases |
found on the right side of the zig zag line of the periodic table | non-metals |
semiconductors that act like metal or non-metals sometimes | metalloids |
found on the left side of the zig zag line of the periodic table | metals |
chemical properties of elements in the same ____ change in a predictable way as you move from one end to the other | period |
elements in a _____ have similar properties | group |
elements in the same period in the Periodic Table have the same number of | shells |