The vertical columns are called families while the horizontal rows are called periods. Matter may be thought of as one single element or a physical or chemical combination of two or more elements. This chapter is designed to help us understand the arrangement of elements on the periodic table and the chemical behavior of elements in certain categories. Anything that is not stationary is considered to be motion. However, as we will learn, almost everything is experiencing some sort of motion.
Motion is actually a change in the position of an object relative to a particular fixed point.
Light and heat are forms of energy that we use our senses to detect. We see color as result of the bending of light rays. Our nerves detect the presence of heat. The sun is our most obvious source of light and heat. The angle at which these rays strike our planet determines the amount of light and heat we recieve, thus determining the seasons.