Atomic Structure

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Bohr Model of the Atom

Relative charge Relative mass Symbol Position in the atom

Proton +1 1 p In the nucleus

Electron -1 1/1840 \(e^-\) Energy levels surrounding nucleus

Neutron 0 1 n In the nucleus

J.J. Thomson discovered the electron.

Ernest Rutherford discovered proton.

James Chadwick discovered the nucleus.

Nucleus: Small core of the atom that contains protons and neutrons and hence, the bulk of the mass of the atom. First suggested by Rutherford.

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Information about an Atom

Atomic number(Z): The number of protons in an element

In the case of a neutral atom, this is also the number of electrons.

Mass number: Number of protons and neutrons in an atom

Isotopes: Atoms of the same element with different numbers of neutrons