Cesium (atomic number 55), this element is an alkali metal, Carbon (atomic number 6), Has 4 valence electrons, Arsenic (atomic number 33), Has 5 valence electrons, Xenon (atomic number 54), this element is a noble gas, Chlorine (atomic number 17), this element is a halogen, Oxygen (atomic number 8), Will gain 2 electrons to be stable, valence electrons, number of outer electrons, columns in the periodic table are called, groups, rows in the periodic table are called, periods, Calcium ( atomic number 20), will lose 2 electrons to be stable

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