1. Using the Periodic Table of Elements October 11, 2015October 11, 2015October 11, 2015

2. Terms to Know Atomic number - the number of protons in an atom's nucleus. It also tells you how many electrons there are. Atomic number - the number of protons in an atom's nucleus. It also tells you how many electrons there are. Example: Carbon has an atomic number of 6; how many protons does carbon have? Electrons? Example: Carbon has an atomic number of 6; how many protons does carbon have? Electrons? Mass number (Atomic Weight) - the number of protons and neutrons in an atom's nucleus. This number is usually larger than the atomic number. Mass number (Atomic Weight) - the number of protons and neutrons in an atom's nucleus. This number is usually larger than the atomic number. Example: Carbon has 6 neutrons and 6 protons. What is the mass number? Example: Carbon has 6 neutrons and 6 protons. What is the mass number?

3. Finding the number of neutrons Number of neutrons = Number of neutrons = mass number (atomic weight) - atomic number. Find the number of neutrons in Nitrogen.

5. Terms to Know Isotopes – are different forms of the same element. They only differ in the number of neutrons in the atom's nucleus. The number of protons ALWAYS remains the same. Isotopes – are different forms of the same element. They only differ in the number of neutrons in the atom's nucleus. The number of protons ALWAYS remains the same.

6. Carbon Isotope

7. Terms to Know Several elements can combine to form compounds, which are substances composed of two or more elements. Several elements can combine to form compounds, which are substances composed of two or more elements. The smallest chunk or part of a compound is a molecule. The smallest chunk or part of a compound is a molecule.

8. Periodic Table The groups, moving from left to right, are The groups, moving from left to right, are,, and Most of the elements in the periodic table are. Most of the elements in the periodic table are. metalsmetalloidsnon-metals. metals

9. Groups of the Periodic Table Metal group – These elements have one, two, or three electrons in the outermost energy level and share electrons more easily than other elements. Examples include Co, Cu, Au, Fe, Pb, and Sn. Metal group – These elements have one, two, or three electrons in the outermost energy level and share electrons more easily than other elements. Examples include Co, Cu, Au, Fe, Pb, and Sn. Nonmetal group – These elements have four five, six, and seven electrons in the outermost energy level and do not lose or share electrons easily. Examples include C, N, and O. Nonmetal group – These elements have four five, six, and seven electrons in the outermost energy level and do not lose or share electrons easily. Examples include C, N, and O. Metalloid group – This group has properties of BOTH METALS and NONMETALS. Examples include B, As, and Si. Metalloid group – This group has properties of BOTH METALS and NONMETALS. Examples include B, As, and Si.