2026 · Q30
Which of the following statements relating to the Modern Periodic Table is/are correct?
- 1The atomic radius increases on moving from left to right across a period.
- 2Germanium, Tellurium, and Copper are transition metals.
- 3The two isotopes of Chlorine occupy the same position in the periodic table.
- 4The metallic property of Ca, Ba, Be and Sr follows the order: Be < Ca < Sr < Ba. Select the answer using the codes given below:
General KnowledgeChemistry
- A3 only
- B1 and 4
- C2 and 3
- D3 and 4
Explanation
Atomic radius decreases from left to right across a period as nuclear charge rises, so statement 1 is false. Germanium and tellurium are metalloids, not transition metals, so statement 2 is false. Isotopes have the same atomic number and therefore occupy the same position in the periodic table (statement 3 true). Metallic character increases down a group, giving Be < Ca < Sr < Ba (statement 4 true). Hence statements 3 and 4 are correct.