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Atoms 10.23.09


Atom The smallest unit of matter.-has all the chemical characteristics of an element.-cannot be seen with a microscope.
Scientific Model An idea that allows us to create explanation of how we think some part of the world works. Similar to theory.
Scientific Evidence When the model is accepted by the scientific community.
Atomic Number Number of protons in the nucleus of an atom.-Number of protons is equal to the number of electrons.
Mass Number Number of protons plus the number of neutrons.
Atomic Mass The weight of a single atom. The same mass number, because most of the weight of an atom is found in the nucleus- electrons weight almost nothing.
Created by: Chirri