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Unit 1 L1
Atoms & Elements
Term | Definition |
---|---|
matter | anything that takes up space and has mass |
element | a material that cannot be broken down into anything simpler |
atom | the smallest unit of an element that still retains (has) the properties of that element |
nucleus | the center of an atom, made up of protons and neutrons |
proton | particles in an atom with one unit of positive electric charge |
atomic number | the number of protons in an atom |
neutrons | particles in an atom with no electric charge. They are neutral |
electrons | particles in an atom with a negative electric charge |
molecules | particles made up of more than one atom joined together |
periodic table | a table that arranges and shows all of the known elements |
particles | the parts in an atom: proton, neutron, electron |