The column of elements that is most likely to combine with sodium in the ratio 1:1 is column 17
Valency electron is the number of electron present in the outermost part of an atomic shell. The columns, or groups, on the periodic table represent the atomic elements that have the same number of valence electrons.
Valency electron determines how atom of elements combine with each other.
Therefore, sodium is in group one or column one. Sodium has a valency electron of one and can easily donate that electron to attain octet rule.
The elements in column 17 has valency electron of 7 therefore, they can easily receive a single electron to attain octet rule.
Therefore, both Sodium(column 1) and column 17 elements in the periodic table will combine to form a 1:1 ratio. For example
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