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chapter 16 sci. quiz
Question | Answer |
---|---|
a positively charged particle | proton |
is an uncharged particle | neutrons |
nucleis/nuclei | the combonation of protons and neutrons |
negatively charged particle that surrounds the nuclis. | electron |
the total number of protons and neutrons in the atoms nucleis. | atomic mass number |
atomic mass | the average of all the elements isotopes |
periodic table | it shows a repeating pattern of properties of the elements. |
the elements in a vertacle column, there are 18 of them | group |
the horizontal rows of elements, there are 7 of them | period |
is formed when an atom loses or gains one or more electrons | ion |
elements that conduct heat and electricity well and have a shiny appearance | metals |
poor conductors of heat and electricity have the opposite properties of metals.they are located at the right side of the table(except hydrogen) | non metals |
they have some of the same characteristics as metals and non metals. they sometimes are good conductuctors of heat and electricity and sometimees they dont. | metalloids |
group 1 | alkali metals |
group 2 | alkali earth metals |
group 17 | halogens |
group 18 | noble gasses |
atomic models | lewis dot and bohr models |
.very reactive | alkali metals |
.still reactive but not as reactive as alkali metals | alkali earth metals |
.less reactive than other metals | groups 3-12 (transition metals) |
.very reactive non metals | halogens |
.almost never react with other elements. | noble gasses |
radioactive atoms produce energy and particles from their nuclei.the identity of these atoms changes because the number of protons changes. | radioactive decay |
the amount of time that it takes for one half of the atoms in a particle sample to decay. | half life |