any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium)

any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium)

any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium)

any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium)

any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium)

any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium)

any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium)

any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium)

any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium)

a soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several minerals