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Q30 (CDS-I/2026) Science & Technology › Basic Science (Physics, Chemistry, Biology)

Which of the following statements relating to the Modern Periodic Table is/are correct? 1. The atomic radius increases on moving from left to right across a period. 2. Germanium, Tellurium, and Copper are transition metals. 3. The two isotopes of Chlorine occupy the same position in the periodic table. 4. The metallic property of Ca, Ba, Be and Sr follows the order : Be < Ca < Sr < Ba. Select the answer using the codes given below:

Result
Your answer: —  Â·  Correct: D

Explanation

The correct statements are 3 and 4. Here is the breakdown:

  • Statement 1 is incorrect: In the Modern Periodic Table, the atomic radius decreases from left to right across a period due to an increase in nuclear charge, which pulls the electrons closer to the nucleus.
  • Statement 2 is incorrect: While Copper is a transition metal, Germanium and Tellurium are classified as metalloids.
  • Statement 3 is correct: The Modern Periodic Table is organized by atomic number. Since isotopes of an element (like Chlorine-35 and Chlorine-37) have the same atomic number, they occupy the same position.
  • Statement 4 is correct: Metallic character (electropositivity) increases down a group as atoms get larger and lose electrons more easily. For Group 2 elements, the order of increasing metallic character is Beryllium (Be) < Calcium (Ca) < Strontium (Sr) < Barium (Ba).
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SIMILAR QUESTIONS

IAS · 2001 · Q121 Relevance score: 1.93

Consider the following statements with reference to the Periodic Table of chemical elements : I. lonisation potential gradually decreases along a period. II. In a group of elements, electron affinity decreases as the atomic weight increases. III. In a given period, electronegativity decreases as the atomic number increases. Which of these statement(s) is/are correct ?

CAPF · 2021 · Q30 Relevance score: 1.03

Which one of the following properties decreases across the periodic table from left to right and increases from top to bottom?

NDA-II · 2008 · Q75 Relevance score: -0.81

Which of the following statements with regard to Isotopes and Isobars is/are correct? 1. Isotopes have same mass number. 2. Isobars have same atomic number. Select the correct answer using the code given below :

IAS · 2003 · Q105 Relevance score: -1.10

Assertion (A) : In the periodic table of chemical elements, electron affinity is always found to increase from top to bottom in a group. Reason (R) : In a group, the atomic radial generally increase from top to bottom.