Match the terms below to the correct definitions. off that you have used them. 21.The mass on the periodie table. 2. Region surounding the nucleus where electrons are found. a. Atom b. Electrons ?3 Positively chargod center of an atom. e. Protons ? d. Neutrons Particles that differ in mumber betwoen isotopes. ?s. Vertical column in the periodic table. e. Electron cloud 6. Positively charged particles in an atom. E. Nucleus _7. Negatively charged particles in the outermost energy levels of the electron cloud. Quark 8. Table that organizes the elements by properties. 9. Atoms of the same element that have different masses. h. Atomic number i. Mass number 10. Smallest known particle that makes up protons and neutrons. j. Average atomic mass 211. All elements in the same one of these has the same number of energy levels in their electron cloud. k. Isotopes 2 12. The smallest form of matter that still retains the properties of an element. L. Valence electrons 2 13. Negatively charged particles in an atom. m. Group 2 14. The sum of protons and neutrons in an atom. n. Period 2 15. Represents the identity of an element. o. Periodic Table 1-11-1-1-1-1-1-1-1-

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Atomic Number

Elements are the building blocks of all the matter that exist in the universe. Every element is made up of atoms that have protons, electrons, and a nucleus. In order to know the difference between the elements, an atomic number is used. Every element has its own individual atomic number. The atomic number is a single most important characteristic of an atom.