Question
Elements in the SAME PERIOD in the table have the same number of __ NEUTRONS in their NUCLEUS PROTONS in their NUCLEUS ELECTRON SHELLS ELECTRONS in their OUTER SHELL
Answer
4.5
(294 Votes)
Julian
Elite · Tutor for 8 years
Answer
C
Explanation
The given options are neutrons, protons, electron shells, and electrons in the outer shell, and we need to determine which feature is shared by elements within the same period. In the periodic table, a period refers to a horizontal row, denoting elements (atoms) with the same number of electron shells (predictable atomic structure concerning energy levels). Thus, Protons and Neutrons are essentially out of running, as they pertain to atomic nuclei not reshuffling in particular sequence throughout a period. The number of electrons in the outer shell however, doesn't always remain consistent as it changes across the period. Thus, for any period on the periodic table, the distinguishing feature of atoms of that period is the unchanging number of electron shells. For this reason, "Electron Shells" is the correct answer.