Vocabulary Set 1 Flashcard

The smallest particle of a given type of matter.
Atomic Number
The # of protons in the nucleus of an atom of an element.
Chemical Property
A property that can be observed only when there is a change in the composition of a substance.
Chemical Reaction
Another term for chemical change.
A chemical combination of 2 or more different elements joined together in a fixed proportion.
Electromagnetic Spectrum
The whole range of electromagnetic radiation.
Negatively charged particle.
Electron Cloud
The space around the nucleus of an atom where the atom’s electrons are found.
A substance that cannot be broken down into simpler substances.
An atom or group of combined atoms that has a charge because of the loss or gain of electrons.
Any 2 or atoms of an element that are chemically alike but have different masses.
Mass Number
The sum of the neutrons & protons in the nucleus of an atom.
A combination of 2 or more substances in which the basic identity of each substance is not changed.
A subatomic particle with a mass equal to a proton but with no electrical charge.
The small, dense, positively charged central core of an atom.
Physical Change
A change in matter where its identity does not change.
Physical Property
A characteristic of matter that is exhibited without a change of identity.
A positively charged sub-atomic particle.

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