Elements in the same vertical group of the periodic table have same
Correct answer: C. Number of valence electrons
- A. Number of electrons
- B. Atomic number
- C. Number of valence electrons
- D. Electronic configurations
Explanation
The correct answer is that elements in the same vertical group of the periodic table have the same number of valence electrons. This is a key feature that defines the chemical properties and reactivity of the elements within a group. Option A is incorrect because the total number of electrons varies across elements in different periods. Option B is incorrect since atomic numbers are unique to each element and increase across the periodic table. Option D is incorrect because the overall electronic configurations differ due to different numbers of electron shells, although the valence shell configuration is similar.
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About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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