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The Atom
The atom, for science lesson 1+ 2
Term | Definition |
---|---|
Atom | is the smallest particle that still can be considered an element. |
Electrons | negatively charged particles. |
Nucleus | a small region in an atom's center |
Protons | positively charged particles in a atom's nucleus. |
Energy Level | The specific amount of energy an electron has. |
Neutron | a particle with no electric charge. |
Atomic Number | the number of protons in a nucleus of an atom. |
Isotopes | atoms with then same number of protons and different number of neutrons. |
Mass Number | the sum of protons and neutrons in the atom. |
Atomic Mass | average mass of all isotopes of that element. |
Periodic Table | an arrangement of elements showing the repeating pattern of their properties. |
Chemical Symbol | below the atomic number. |
Periods | an arrangement of rows. |
Group | an arrangement of columns. |