Question

write all the alkaline earth metals and noble gases. It's symbols, atomic number and it's atomic mass...​

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).

Explanation:

The alkali metals are so reactive that they are generally found in nature combined with other elements. Simple minerals, such as halite (sodium chloride, NaCl), sylvite (potassium chloride, KCl), and carnallite (a potassium-magnesium chloride, KCl · MgCl2· 6H2O), are soluble in water and therefore are easily extracted and purified. More complex, water-insoluble minerals are, however, far more abundant in Earth’s crust. A very dilute gas of atomic sodium (about 1,000 atoms per cubic cm [about 16,000 atoms per cubic inch]) is produced in Earth’s mesosphere (altitude about 90 km [60 miles]) by ablation of meteors. Subsequent reaction of sodium with ozone and atomic oxygen produces excited sodium atoms that emit the light we see as the “tail” of a meteor as well as the more diffuse atmospheric nightglow. Smaller amounts of lithium and potassium are also present.