Substances composed of a single type of atom are ?

The subatomic particle that has a positive charge is the ?

An atom that has an electrical charge is a(n) ?

According to the electron-cloud model, electrons move unpredictably through regions of space called ?

Elements are given unique abbreviations known as ?

Protons and neutrons are made up of smaller particles called ?

A positively charged ion is called a(n) ?

Atoms of the same element that have different number of neutrons are called ?

The principle stating that it is impossible to know both the position and velocity of an electron simultaneously is ?

The overall motion of each electron can be mathematically represented by four ?

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