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Can some one list all the exceptions in the periodic trends?
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Can some one list all the exceptions in the periodic trends?
Exceptions in Periodic Trends
- Ionization Energy: Ionization energy is the energy required to remove an electron from a neutral atom. The trend of ionization energy generally increases across a period and decreases down a group. However, there are a few exceptions:
- The elements in Group 2 (alkaline earth metals) have lower ionization energies than those in Group 3 (boron group).
- The ionization energy of nitrogen is higher than that of oxygen due to the half-filled p subshell of nitrogen.
- The ionization energy of beryllium is higher than that of boron due to the stable electron configuration of boron.
- Atomic Radius: Atomic radius is the distance from the center of an atom to its outermost electron. The trend of atomic radius generally decreases across a period and increases down a group. However, there are a few exceptions:
- The atomic radius of helium is smaller than that of hydrogen due to the presence of a filled 1s subshell in helium.
- The atomic radius of fluorine is smaller than that of oxygen due to the increased nuclear charge in fluorine.
- The atomic radius of scandium is larger than that of titanium due to the shielding effect of the 3d electrons in titanium.
- Electronegativity: Electronegativity is the tendency of an atom to attract electrons towards itself when it is chemically bonded to another atom. The trend of electronegativity generally increases across a period and decreases down a group. However, there are a few exceptions:
- The electronegativity of oxygen is higher than that of nitrogen due to the smaller size of oxygen.
- The electronegativity of fluorine is higher than that of chlorine due to the smaller size of fluorine.
- The electronegativity of copper is lower than that of zinc due to the increased shielding effect of the 3d electrons in copper.
- Metallic Character: Metallic character is the tendency of an atom to lose electrons and form a positive ion. The trend of metallic character generally increases down a group and decreases across a period. However, there are a few exceptions:
- The elements in Group 13 (boron group) have lower metallic character than those in Group 2 (alkaline earth metals).
- The metallic character of carbon is lower than that of boron due to the half-filled p subshell of boron.
- The metallic character of selenium is higher than that of tellurium due to the increased nuclear charge in tellurium.
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Can some one list all the exceptions in the periodic trends? for Class 11 2025 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about Can some one list all the exceptions in the periodic trends? covers all topics & solutions for Class 11 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Can some one list all the exceptions in the periodic trends?.
Can some one list all the exceptions in the periodic trends? for Class 11 2025 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about Can some one list all the exceptions in the periodic trends? covers all topics & solutions for Class 11 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Can some one list all the exceptions in the periodic trends?.
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