Answer: Group 8 (d-block, 5d series = Osmium Os).
- A Group 8 (d-block, 5d series = Osmium Os)
- B Group 6, matching the chromium-molybdenum-tungsten family
- C Group 18, the noble gas family with filled valence shells
- D Group 2, the alkaline earth metal family
Correct answer: A. Group 8 (d-block, 5d series = Osmium Os)
Explanation: [Xe] 4f<sup>14</sup> 5d<sup>6</sup> 6s<sup>2</sup>: 5d<sup>6</sup> means 6 d-electrons in period 6. Group = 6+2 = 8. This is Osmium (Os).
The complete modern periodic table (118 elements). Image: Cepheus et al., Public Domain, via Wikimedia Commons.
Concept context
The periodic table organises all 118 elements by atomic number and similar properties. Study periodic trends like atomic radius, ionization energy, and electronegativity, and learn how an element's position predicts its behaviour.
Read the full Classification of Elements and Periodicity in Properties notes →