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chapter 16 sci. quiz

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
Created by: hollistersusu8