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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.
Argon is a noble gas and is found in group 18 on the periodic table.... Argon has 18 protons and 18 electrons. Its atomic number is 18, and its mass number is 40 grams per mole. Argon is a noble gas and is found in group 18 on the periodic table.... Argon has 18 protons and 18 electrons. Its atomic number is 18, and its mass number is 40 grams per mole. Argon is a noble gas and is found in group 18 on the periodic table. Continue Reading