Groups 1-2 (except hydrogen) and 13-18 are termed main group elements. x Remember that the reactivity increases as you move down Group 2 (see ionisation energies) Physical properties: x All light metals. The group 16 elements of modern periodic table consist of 5 elements oxygen, sulphur, selenium, tellurium and polonium. Those outer electrons are also called valence electrons. Group 2 elements generally react to form compounds in which the group 2 element has an oxidation state of +2, beryllium will also do this but it has a tendency to form covalent rather than ionic compounds. Groups 1-2 termed s-block elements. Seven valence electrons, so elements from this group typically exhibit a -1 oxidation state; Noble Gases . Alkali Earth Metals – Group 2 Elements. Every element in the first column (group one) has one electron in its outer shell. The elements in each group have the same number of electrons in the outer orbital. (3) Both group 1 and group 2 elements produce white ionic compounds. The alkaline earth metals are six chemical elements in group 2 of the periodic table. Unlike other groups, noble gasses are unreactive and have very low electronegativity or electron affinity. Included in the group two elements are Beryllium(Be), Magnesium(Mg), Calcium(Ca), Strontium(Sr), and Barium(Ba). They are transition metals because they have electrons in their d sublevels. Introduction. • Explain the importance to organisms of selected p-block elements. • Define allotropes and provide examples. Usually, there is no need to store these elements in oil, unlike the group one elements. x Compounds are white or colourless. elements in the same group are similar to each other; A section of the periodic table showing metals and non-metals. Although many characteristics are common throughout the group, the heavier metals such as Ca, Sr, Ba, and Ra are almost as reactive as the Group 1 Alkali Metals.All the elements in Group 2 have two electrons in their valence shells, giving them an oxidation state of +2. Groups 3-12 are termed d-block elements. Groups 3-11 are termed transition elements. The group number is an identifier used to describe the column of the standard periodic table in which the element appears. PubChem is working with IUPAC to help make information about the elements and the periodic table machine-readable. - The Group 2A elements are called alkaline earth metals. The group 2 elements are called the alkaline earth metals. Group 2 Group 2 elements: Redox eactions: The Group 2 elements: x These are also called the alkaline earth metals as their hydroxides are alkaline. Finally, IUPAC assigns collective names (lanthanoids and actinoids) and group numbering (1 to 18) and has investigated the membership of the group 3 elements. The noble gasses have complete valence electron shells, so they act differently. Compare this with the coloured compounds of most transition metals. They are the electrons involved in chemical bonds with other elements. The transition metals are in groups 3 - 12. 186 Chapter 7 The Elements Section 7.2 Properties of p-Block Elements Objectives • Describe and compare properties of p-block elements. - The Group 1A elements are called alkali metals. x They have reasonably high melting and boiling points. For a metal, alkali earth metals tend to have low melting points and low densities. They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium … - The nonmetals of Group 7A are called halogens. 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