In the modern periodic table, calcium (a...

In the modern periodic table, calcium (atomic number20) is surrounded by element with atomic number 12,19,21 and 38 which of these have physical and chemical properties resembling calcium?

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MBD-PERIODIC CLASSIFICATION OF ELKHOENTS-EXAMPLE

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In the modern periodic table, calcium (atomic number20) is surrounded ...
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Why do we classify elements?
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Why did mendeleev leave some gaps in his periodic table?
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