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Chapter 17 Q & A


What determines the size of an atom? the # of electrons
If you compare atoms to visible light, which is smaller? the atoms
What do molecules make up in the universe? some matter
What term describes the make up of a molecule? atoms
What is the cause of Brownian motion? random movement of atoms and molecules
What term describes the makes up an element? the same kind of atoms
How many elements do we know about? slightly more than 100
Describe plasma. mixture of ions and electrons, electrically charged. It is a phase of matter.
What are the phases of matter? plasma, solids, liquids, and gases
In the shell model of an atom, where are the electrons? in the shells
What is the # of atoms in a typical breath equal to? the breaths of air in the world
What is an ion? an atom w/a different # of electrons than protons
What do protons attract in an atom? electrons
What is an isotope? An atom that has one more or one less neutron than protons in the nucleus.
Where did the atoms formed in our bodies originally come from? Atoms came from stars, and from other matter prior to our existence.
Created by: cdeutsch