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Finely powdered strontium metal is sufficiently reactive to ignite spontaneously in air. It reacts with water quickly (but not violently like the Group 1 metals) to produce strontium hydroxide and hydrogen gas. Strontium and its compounds burn with a crimson flame and are used in fireworks. Strontiumâs Periodic Table Neighborhood Strontium is a Group 2 Alkaline earth metal. It usually exists as a divalent ion, Sr 2+, in its compounds. Strontiumâs chemistry is very similar to that of calcium, which sits above it in Group 2.
Copper is found in many ionic compounds in the form of either the Cu + or the Cu 2+ ion. The metallic elements are found on the left side and in the centre of the periodic table. The metals of Groups 1 and 2 are called the representative metals; those in the centre of the periodic table are called the transition metals.