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11 Cards in this Set

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atom
basic building block of matter, smallest unit of chemical element
What is the atom composed of?
protons, neutrons, and electrons (subatomic particles)
Protons and neutrons form the
nucleus
The electrons exist outside the nucleus in regions of space called
orbitals
What shows similar chemical properties and cannot be broken down further by chemical means?
element
What is the charge and mass of a proton?
positive and 1 atomic mass unit
atomic number
number of protons found in an atom of that element
What is charge and mass of neutron?
no charge and mass slightly different than proton
isotope
different number of neutrons but same number of protons.
mass number
equal to the number of protons and neutrons
Convention X with Z on bottom and A on top
X is the element
Z is the atomic number
A is the mass number