Science Atomic structre
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pink on periodic table
metals
blue on periodic table
non metals
atomic number
number of protons and electrons
how to find the number of neutrons
atomic mass-number of protons
what are the rows
number of shells
what are the colums
valence electrons
what is the exception for colums of valence electrons
helium it has 2 valence electrons
valence electrons in metals
3 or less
valence electrons in non metals
5 or more
do metals gain or lose
lose
do non metals gain or lose
gain
when are atoms most stable
when their valence shell is full
are atoms able to gain or lose electrons
yes
what is an isotope
a version of an element with diff numbers of neutrons and mass
isotopes have
the same number of protons as the original element
how do u find the number of neutrons in an isotope
use the mass in the name of the isotope and minus the protons from that
using carbon 13 isotope how do u write the name and symbol
carbon-13 13c
what is an ion
when it gains or loses electrons to become stable
when an atom loses an electron
it becomes positive
when an atom gains an electron
it becomes negative
ion symbol
element symbol, charge, then number of electrons it gains or loses
what are cations
positive charge, when an itom loses electrons, add ion to name of the element
what are anions
negative charge, when an atom gains electrons, add ide to name of the element
what are the four major models pf the atom
billiard ball, plum pudding, nuclear model, planetary model