Parts of the Periodic Table the horizontal rows are called periods. the vertical rows are called groups. Alkali Metals - make up Group 1A of the - - table, and comprise lithium (Li) through francium (Fr). These elements have very similar behavior and characteristics. They are all metals and very reactive except for H. rapidly react with the air, water vapour and oxygen in the air. Contain one valence electron Alkaline Metals - metals make up Group 2A - - of the periodic table, from beryllium (Be) through radium (Ra). The alkaline earth metals have very high melting points and oxides that have basic alkaline solutions. All the elements in this group are denser than water. Pure metals are silver-grey colored, also very reactive. Contain 2 valence electrons. Boron Group - make up Group IIIA of the periodic table, from boron (B) through Nihonium (Nh). - Contain 3 valence electrons. - Al, the most abundant metallic element in the earth's crust. - Compounds of boron, notably borax, have been known since early times Boron Group - make up Group IIIA of the periodic table, from boron (B) through Nihonium (Nh). - Contain 3 valence electrons. - Al, the most abundant metallic element in the earth's crust. - Compounds of boron, notably borax, have been known since early times Carbon Group - make up Group IVA of the periodic table, from Carbon (C) through Flerovium (Fl). - Contain 4 valence electrons. - These elements are found in a wide variety of compounds. Carbon ...
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