Sulfur and selenium atoms are similar in the number of a) electrons in the atom

Sulfur and selenium atoms are similar in the number of a) electrons in the atom b) protons in the nucleus c) electrons at the outer level d) electronic levels

The chemical elements sulfur and selenium are in the Periodic Table of chemical elements in the same sixth group, the main subgroup, but in different periods. Such atoms have the same number of electrons at the outer level. Answer (c).



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