Periods are …………… [5, 6, 7] horizontal rows of elements in the periodic table and an element with three electron shells and two electrons in it’s valence shell belongs to period …………… [6, 3, 1] and group …………… [3, 6, 2].

Question

Periods are &#8230;&#8230;&#8230;&#8230;&#8230; [5, 6, 7] horizontal rows of elements in the periodic table and an element with three electron shells and two electrons in it&#8217;s valence shell belongs to period &#8230;&#8230;&#8230;&#8230;&#8230; [6, 3, 1] and group &#8230;&#8230;&#8230;&#8230;&#8230; [3, 6, 2].

Flash Institute · Accepted Answer

Periods are 7 horizontal rows of elements in the periodic table and an element with three electron shells and two electrons in it&#8217;s valence shell belongs to period 3 and group 2.

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