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What are cathode rays
Streams of negatively charged particles called electrons that travel in straight lines from the cathode to the anode , are deflected by electric and magnetic fields, and have sufficient energy to move a small object like a paddle wheel
What is an energy level
The fixed energy that an electron in an atom may have
What is an orbital
A region in space within which there is a high probability of finding an electron
What is the ground state of an atom
One in which the electrons occupy the lowest availabke energy levels
What is the excited state of an atom
One in which the electrons occupy higher energy levels than those available in the ground state
What is the Heisenberg uncertainty principle
States that it is impossible to measure at the same time both the velocity and the position of an electron
What is a sublevel
A subdivision of a main energy level and consists of one or more orbital of the same energy
What is an element
A substance that cannot be split into simpler substances by chemical means
What is the atomic number of an atom
The number of protons in the nucleus of that atom
What is the mass number of an element
The sum of the number of protons and neutrons in the nucleus of an atom of that element
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