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Q:

What are the group trends in melting point, boiling point, reactivity, size of atom (atomic radius), density and physical strength as you go down the group 1 alkali metals as the atomic/proton number increases?

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the melting point and boiling point generally decrease down Group 1 (see data table below) the element gets more reactive down Group 1 with increase in atomic number (explanation) the atoms get bigger down Group 1 (as more electron shells are added, see data table below) generally the density increases down Group 1 (see data table below), although the atom gets bigger, there is a greater proportional increase in the atomic mass (see data table). generally the hardness decreases down Group 1 * For advanced AS level: The bonding in metals involves the attraction between free negative electrons moving between positively ionised metal atoms (M+ ions). As the atomic radius increases the charges (positive nucleus and delocalised electrons) are further apart and the electrical attractive force is reduced. This weaker bonding results in a weaker-softer structure with a lower melting/boiling point. A Level Chemistry AS-A2 Notes on s-block Gp 1 Alkali Metals & Gp2 Alkaline Earth Metals There ... more
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