PerodicTableProject

Hydrogen
 * one proton and one electron

Alkaili metal proprieties


 * they have low melting and boiling points compared to most other metals
 * they are very soft
 *  explode at concentrations ranging from 4-75 percent by volume in the presence of sunlight, a flame, or a spark.
 * It has an average atomic weight of 1.0079 amu.
 * can be cut easily with a knife
 * they have low densities (lithium, sodium and potassium will float on water)
 * dissolve in water to form alkaline solutions''

Similarities

Atomic and ionic radii Atomic weight Reactivity Electron gravity Melting and boiling points Density

Properties of the alkali metals  "Alkali Metal Properties." //Wikipedia//. Wikimedia Foundation, n.d. Web. 12 Oct. 2016. .
 * ~  ||~ Lithium ||~ Sodium ||~ Potassium ||~ Rubidium ||~ Cesium Francium ||
 * Atomic number || 3 || 11 || 19 || 37 || 55 || 87 ||
 * Standard atomic weight || 6.94(1) || 22.98976928(2) || 39.0983(1) || 85.4678(3) || 132.9054519(2) || [223] ||
 * Electron configuration || 2s 1 || 3s 1 || 4s 1 || 5s 1 || 6s 1 || 7s 1 ||
 * Melting point (°C) || 180.54 || 97.72 || 63.38 || 39.31 || 28.44 || 30 C ||
 * Boiling point (°C) || 1342 || 883 || 759 || 688 || 671 || 680 C ||
 * Density || 0.534 || 0.968 || 0.89 || 1.532 || 1.93 || 1.873 ||
 * Atomic radius || 152 || 186 || 227 || 248 || 265 || 200 ||
 * Ionic radius || 76 || 102 || 138 || 152 || 167 || 200 ||
 * Electronegrativity || 0.98 || 0.93 || 0.82 || 0.82 || .79 || .7 ||

 He Ne Ar Kr Xe Rn
 * Density (g/dm 3 ) || 0.1786 || 0.9002 || 1.7818 || 3.708 || 5.851 || 9.97 ||
 * Boiling point (K) || 4.4 || 27.3 || 87.4 || 121.5 || 166.6 || 211.5 ||
 * Melting point (K) || 0.95 || 24.7 || 83.6 || 115.8 || 161.7 || 202.2 ||
 * Atomic number || 2 || 10 || 18 || 36 || 54 || 86 ||
 * Atomic radius || 31 || 38 || 71 || 88 || 108 || 120 ||
 * Ionization energy (kJ/mol) || 2372 || 2080 || 1520 || 1351 || 1170 || 1037 ||

"Physical and Atomic Properties." //Wikipedia //. Wikimedia Foundation, n.d. Web. 16 Oct. 2016. .