ACC Biology Accuplacer Study Guide question and Answer

ACC Biology Accuplacer Study Guide question and Answer Atomic Structure Correct Answer: Protons and neutrons make up the nucleus of an atom.The nucleus is surrounded by a cloud of negatively charged electrons which are bound to the nucleus by an electromagnetic force. Identifying Elements Correct Answer: Elements are arranged based on their atomic and mass numbers on the periodic table of elements. As you go across the table the atomic weight increases. Radioisotopes Correct Answer: A naturally or artificially produced radioactive isotope of an element. Molecules Correct Answer: The smallest possible amount of a particular substance that has all the characteristics of that substance. Formed when two or more atoms join together chemically. Compounds Correct Answer: A molecule that contains at least two different elements. The role of electrons in chemical bonding Correct Answer: The electron in the outermost shell of an atom chemically bonds with another atom. Electrons have a negative charge and orbit around the nucleus in the electron shells. Chemical equation Correct Answer: A symbolic representation of the starting substances(reactants) and the chemical formula of the products.