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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