A chemical element is a substance that contains only one type of atom. If a substance contains more than one type of atom, it is a compound. An element can be a solid, liquid or gas. The smallest particle of such an element is an atom. Atoms are made up of protons, neutrons, and electrons.
DIY home installed concrete countertops cost $8-$15 per square foot for materials, running $240-$450 for a typical 30 square foot kitchen counter. Professionally built and installed concrete countertops cost $70-$100 per square foot, or $2,100-$3,000 for a typical 30 square foot kitchen counter.
Some manufacturers require a minimum purchase. Slab granite countertops--solid pieces of granite custom cut to the width and shape of a countertop -- cost $60-$100 per square foot depending on the color and rarity of the granite, the style of edging. Expect to pay $1,800-$3,000 for a typical kitchen, installed.