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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)