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Using the Periodic Table of Elements

Using the Periodic Table of Elements. November 20, 2014. Terms to Know. 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?

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Using the Periodic Table of Elements

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  1. Using the Periodic Table of Elements November 20, 2014

  2. Terms to Know • 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? • 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?

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

  4. Terms to Know • Isotopes – aredifferent 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. • Radioactivity – in some instances the nucleus of an atom becomes unstable and emits radiation.

  5. Carbon Isotope

  6. Periodic Table • The groups, moving from left to right, are , , and • Most of the elements in the periodic table are . metals metalloids non-metals. metals

  7. 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. • 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.

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