CHAPTER 4- ATOMIC STRUCTURE – CHEMISTRY. Quality content you can rely on!

CHAPTER 4- ATOMIC STRUCTURE – CHEMISTRY.
Quality content you can rely on!
Nucleus - Answer: The dense, positively charged mass located in the center of an
atom.


Proton - Answer: A positively charged subatomic particle that is found in the nucleus of
an atom.


Electron - Answer: A negatively charged subatomic particle that is found in the space
outside the nucleus of an atom.


Neutron - Answer: A neutral subatomic particle that is found in the nulceus of an atom.


Atomic number - Answer: A unique number for each element that equals the number of
protons in an atom of that element.


Mass number - Answer: The sum of the number of protons and neutrons in the nucleus
of an atom.


Isotopes - Answer: Atoms of a given element that have different numbers of neutrons
and different mass numbers.


Energy levels - Answer: The possible energies that electrons in an atom can have.


Electron cloud - Answer: A visual model of the most likely locations for the electrons in
an atom.


Orbital - Answer: A region of space around the nucleus where an electron is likely to be
found.




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