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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?
|What do molecules make up in the universe?
|What term describes the make up of a molecule?
|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
|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?
|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.