The correct answer is Magnesium. • Magnesium is known as alkaline earth metal. Explanation & Key Takeaways: • The alkaline earth metals are named after the alkaline earth whose old-fashioned names were beryllia, magnesia, lime, strontia, and baryta, after their oxides. When mixed with water, these oxides are simple (alkaline). • The elements of Group 2 of the periodic table are alkaline earth metals. • Beryllium, magnesium, calcium, strontium, barium, and radium are the elements in Group 2. • For two reasons, these elements are referred to as Alkaline Earth metals. Their oxides remain in the crust of the earth and are very heat-stable. • In group 1 of the periodic table, alkali metals are the elements. • The key distinction between alkaline and alkali is that there is one valence electron in alkali metals, while two valence electrons are in alkaline earth metals. Related Concepts: +-----------+------------------------------------------------------------------------------------------------------------------------+ | Metal | Details | +-----------+------------------------------------------------------------------------------------------------------------------------+ | Copper | Copper is a chemical element with the symbol Cu and atomic number 29. Atomic mass: 63.546 u Melting point: 1,085 °C. | | Platinum | Platinum is a chemical element with the symbol Pt and atomic number 78. Atomic mass: 195.084 u Melting point: 1,768 °C | | Cobalt | Cobalt is a chemical element with the symbol Co and atomic number 27. Atomic mass: 58.933195 u Melting point: 1768 K | | Magnesium | Magnesium is a chemical element with the symbol Mg and atomic number 12. Atomic mass: 24.305 u Melting point: 650 °C | +-----------+------------------------------------------------------------------------------------------------------------------------+