From the following elements: Select the element having one electron in the outermost shell

CBSE Class 10 CBSE Class 10 Science
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From the following elements:
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  1. Select the element having one electron in the outermost shell.
  2. Two elements of the same group.

Write the formula and mention the nature the compound formed by the union of 19K and element
X (2,8,7).
Answer:
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  1. K
  2. Be and Ca as both have same number of valence electrons, i.e., 2.
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