2.1 Flashcards
Name the 3 parts of an atom
proton, neutron, electron
what particles are in the nucleus
protons and neutrons
name the charges of the 3 particles
proton- positive
electron- negative
neutron- no charge
Neutron role
to stabilize nucleus
what particles count for mass
proton and neutrons
Where are electrons located
outside of the nucleus
What changes in isotopes
neutrons
list 2 ways isotopes can be used as tracers
- radioactivity
- difference in mass
do isotopes react differently in chemical reactions
no
Valence electrons
electrons located on the outermost shelf of an atom
Why are valence electrons important
they are what participate in chemical reactions
octet rule
every atom wants a full valence shelf which is usually 8
what makes an atom stable or unstable
neutrons
what determines atomic number
proton
an atom has 8 protons, 8 neutrons, and 10 electrons.
element?
mass number?
net charge?
oxygen
16
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