1. the basic building block of matter are atoms. every atom is basically a tiny sphere. every atom is composed of 2 regions, the outer part of the sphere is called the and accounts for about 99.95% of the volume of an atom. 2. the electron cloud is the region of an atom in which the are found. are tiny particles with a -1 electrical charge and almost no mass. electricity is flowing though a conductor, usually metal. 3. every atom is composed of 2 regions. the very tiny center part of the spherical atom is called the the accounts for about 99.95% of the mass of the atom even though it has almost no volume. 4. every atom has a nucleus. the nucleus contains 2 different types of particles. the particle with the +1 electrical charge is called the it has almost 2000 times more mass than an electron. the number of in the nucleus determine how many electrons the neutral atom has and all of the chemical reactions the atom can do. 5. every atom has a nucleus. the nucleus contains 2 different types of particles. the particle with no (0) electrical charge is called the this particle is electrically neutral. the +1 charged protons would repel each other and destroy the nucleus if the were not neutralizing the repulsive force between the protons. 6. when graphing how the experimental “effect” depends on the experimental “cause”, the graph can show either a or an inverse relationship or no relationship. if the “effect” (dependent variable) value increases when we make the “cause” (independent variable) value increase, then we call this a 7. when graphing how the experimental “effect” depends on the experimental “cause”, the graph can show either a direct relationship or an or no relationship. if the “effect” (dependent variable) value decreases when we make the “cause” (independent variable) value increase, then we call this an 8. when graphing how the experimental “effect” depends on the experimental “cause”, the graph can show either a direct relationship or an inverse relationship or if the “effect” (dependent variable) value doesn’t change when we make the “cause” (independent variable) value increase, then we call this 9. an experiment needs an to validate its results. the can be one of 2 things. the can be a set of experimental conditions we repeat several times throughout the experiment. or the can be a set of conditions which other experimenters have used and is considered “normal” or “state of the art.” 10. a variable is something which can change during an experiment. it works best when we only let 2 variables change. all the rest are kept constant and are called fill in the blanks with these words. direct relationship ,no relationship ,proton(s), neutron(s), controlled variable(s), electron(s), experimental control, inverse relationship, electron cloud, nucleus.