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

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