In which of the following atoms, the Is orbital is the smallest in size?
Correct answer: D. iodine 200
- A. bromine
- B. chlorine
- C. fluorine
- D. iodine 200
Explanation
For all elements in general, the higher the atomic number, the smaller the 1s orbital. The 1s orbital is closest to the nucleus. Therefore, it is mostly in the nucleus's positive electrostatic field. The greater the atomic number, the greater the number of electrons in the outer shells, and thus, the greater the electrostatic force between the nucleus and electrons. Now, among all the halogens, iodine has the highest atomic number (127). Thus, the first orbital of iodine is the smallest.
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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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