Question

Calcium (Ca) / Strontium 40.1+7373
Ba 401
Ta B, 1 Chlorine (C) Bromine 35,5 + 126,
9
88.7/
127
(Na)
Poussium (k
Lithium (Li) Sodium 0,
9 31 = 29.0
23.0
39.1
(Sr)
Barium (Ba)
Ca. Sr.
87.6
137.3
(Br)
Iodine (1)
79.9
126.9
355 1
2.1 Dobereiner's Triads
Can you tell Identify Dobereiner's triads from the following arou
elements having similar chemical properties.
1. Ma (24.3). Ca (40,1), Sr (87.6) 2. S (32.1), Se (79.0), Te (127.6)
3. Be (940), Mg (24.3), Ca (40.1)​

Answer 1

Answer:Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar to its heavier homologues strontium and barium.Sodium is a chemical element with the symbol Na and atomic number 11. It is a soft, silvery-white, highly reactive metal. Sodium is an alkali metal, being in group 1 of the periodic table, because it has a single electron in its outer shell, which it readily donates, creating a positively charged ion—the Na⁺ cation Lithium compounds, also known as lithium salts, are primarily used as a psychiatric medication. It is primarily used to treat bipolar disorder and treat major depressive disorder that does not improve following the use of antidepressants. In these disorders, it reduces the risk of suicide. Lithium is taken by mouth.

Barium is a chemical element with the symbol Ba and atomic number 56. It is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Because of its high chemical reactivity, barium is never found in nature as a free element.

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Explanation: