chapter 2 Flashcards
Anything with mass and taking up space. Anything seen, smelled or felt.
Matter
Capacity to do work
Energy
Stored energy, not used
Potential Energy
Energy in motion
Kinetic Energy
How many different kinds of elements in the human body?/ What are the 4 most common?
20/ Carbon, hydrogen, nitrogen, oxygen
Two of more combined atoms of the same element
Molecule
Two or more combined atoms of different elements
Molecule/compound
Attractions between two or more atoms
Chemical Bonds
Atoms are composed of ___
Subatomic Particles
Positive Charged Subatomic Particles
Protons
Negative Charged Subatomic Particles
Electrons
Subatomic Particles with no charge
Neutrons
Outermost shell of an atom
Valence Shell
How many electrons in a stable valence shell?
8
not a physical bond, but an energy relationship
Bond