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Atoms

7th Grade Physical Science

QuestionAnswer
The smallest particle into which an element can be divided and still be the same element. atom
The tool scientists used to see very small things. microscope
The theory created by John Dalton that said all matter is made up of atoms. The Atomic Theory
Particles within the atom that have a negative charge. electrons
A small, dense center inside of atoms that have a positive charge and surrounded by electrons. nucleus
Ernest Rutherford discovered that the nucleus is made up of smaller, positive charged particles called ? protons
A model created by Niels Bohr that explains how electrons in atoms behave (move). Bohr's model
Scientists James Chadwick discovered that a nucleus contains uncharged particles called ? neutrons
Electrons move within an area around the nucleus called ? electron cloud
The number of protons in the nucleus of an atom. atomic number
The number of protons and neutrons in an atom's nucleus is called? mass number