Atomic radius
Atomic radius is a Science & Technology concept from the MPSC syllabus, tested in 2 past MPSC questions (2019, 2020). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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शास्त्रीय तर्कानुसार. खालीलपैकी कोणती विधाने अचूक असतील.
(a)अणुपेक्षा त्याच्या कटायनचे आकारमान कमी असते.
(b)अणुपेक्षा त्याच्या अनामनचे आकारमान कमी असते.
(c)अणुपेक्षा त्याच्या कटायनचे आकारमान जास्त असते.
(d)अणुपेक्षा त्याच्या अनायनचे आकारमान जास्त असते.
A cation is formed by losing electrons, making its size smaller than the neutral atom (statement a). An anion is formed by gaining electrons, making its size larger than the neutral atom (statement d).
आधुनिक आवर्तसारणीतील अणूची त्रिज्या हा आवर्ती गुणधर्म विचारात घेता खालीलपैकी कोणती विधाने बरोबर आहेत ? / In modern periodic table, which of the following statements about atomic radius are true ?
(a)वरून खाली जाताना वाढते. / Increases from top to bottom
(b)वरून खाली जाताना कमी होते. / Decreases from top to bottom
(c)डावीकडून उजवीकडे जाताना वाढते. / Increases from left to right
(d)डावीकडून उजवीकडे जाताना कमी होते. / Decreases from left to right
Atomic radius increases down a group due to the addition of new electronic shells, and decreases across a period from left to right due to increased effective nuclear charge.