Atomic Theory & Atomic Structure

Subatomic particles with a negative charge

subatomic particles found on the outermost shell & responsible for the atom's reactivity

Subatomic particles with a positive charge

Measure mainly of the nuclear particles: protons + neutrons

Value representing the number of protons in an element

Subatomic particles that are neutral in charge

Atoms of the same element with a different number of neutrons

A charged atom

The smallest particle of an element that shows all the properties of that element.

Where electrons are likely to be found as they travel around the nucleus

A tiny but very dense, positively charged portion of the atom that holds most of the atomic mass

Arrangement of elements organized by atomic number

Discovered the nucleus of the atom through the Gold Foil Experiment

Proposed the Modern Electron Cloud Model of the atom

Discovered the electron within the atom

Created the Planetary Model of the atom

Discovered the neutron within the atom

Believed that atoms of the same element are identical to each other

Calculation used to find the number of neutrons in an atom

The only element with no neutrons in its nucleus.

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