In the modern periodic table, all the elements are arranged in ascending order of:
Correct answer: C. Atomic number
- A. Valency
- B. Atomic mass
- C. Atomic number
- D. Valence electrons
Explanation
The atomic number (protons in the nucleus) uniquely identifies each element and determines its place in the periodic table. Elements are arranged with increasing atomic number, leading to patterns and trends in their properties.
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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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