Question

⭐How many atoms of an element with atomic number 35 can combine with an atom of an element with atomic number 20? Explain

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Answer 1

atomic number of element 1=35
:. electronic configuration=2,8,18,7
:. Valence electrons=7
:. valency of element 1= -1

atomic number of element 2=20
:. electronic configuration=2,8,8,2
:. Valence electrons=2
:. valency of element 2= +2

:. according to Criss cross method,
2 atoms of element 1 combine with 1 atom of element 2 to form a stable element.

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