8.2 Families and Periods of the Periodic Table

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Presentation transcript:

8.2 Families and Periods of the Periodic Table Chemistry 2013 - 2014

Section 8.2 Classification of the Elements Explain why elements in the same group have similar properties. valence electron: electron in an atom's outermost orbitals; determines the chemical properties of an atom Identify the four blocks of the periodic table based on their electron configuration. Elements are organized into different blocks in the periodic table according to their electron configurations.

Section 8.2 Classification of the Elements Recall electrons in the highest principal energy level are called valence electrons. All group 1 elements have one valence electron.

Section 8.2 Classification of the Elements The energy level of an element’s valence electrons indicates the period on the periodic table in which it is found. The number of valence electrons for elements in groups 13-18 is ten less than their group number.

Section 8.2 Classification of the Elements

Section 8.2 Classification of the Elements The shape of the periodic table becomes clear if it is divided into blocks representing the atom’s energy sublevel being filled with valence electrons.

Section 8.2 Classification of the Elements s-block elements consist of group 1 and 2, and the element helium. Group 1 elements have a partially filled s orbital with one electron. Group 2 elements have a completely filled s orbital with two electrons.

Section 8.2 Classification of the Elements After the s-orbital is filled, valence electrons occupy the p-orbital. Groups 13-18 contain elements with completely or partially filled p orbitals.

Section 8.2 Classification of the Elements The d-block contains the transition metals and is the largest block. There are exceptions, but d-block elements usually have filled outermost s orbital, and filled or partially filled d orbital. The five d orbitals can hold 10 electrons, so the d-block spans ten groups on the periodic table.

Section 8.2 Classification of the Elements The f-block contains the inner transition metals. f-block elements have filled or partially filled outermost s orbitals and filled or partially filled 4f and 5f orbitals. The 7 f orbitals hold 14 electrons, and the inner transition metals span 14 groups.

Section 8.2 Classification of the Elements Which of the following is NOT one of the elemental blocks of the periodic table? A. s-block B. d-block C. g-block D. f-block

Section 8.2 Classification of the Elements Which block spans 14 elemental groups? A. s-block B. p-block C. f-block D. g-block