Vocabulary Set 1 Flashcard

Atom
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.
Compound
A chemical combination of 2 or more different elements joined together in a fixed proportion.
Electromagnetic Spectrum
The whole range of electromagnetic radiation.
Electron
Negatively charged particle.
Electron Cloud
The space around the nucleus of an atom where the atom’s electrons are found.
Element
A substance that cannot be broken down into simpler substances.
Ion
An atom or group of combined atoms that has a charge because of the loss or gain of electrons.
Isotope
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.
Mixture
A combination of 2 or more substances in which the basic identity of each substance is not changed.
Neutron
A subatomic particle with a mass equal to a proton but with no electrical charge.
Nucleus
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.
Proton
A positively charged sub-atomic particle.

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