Question

Without looking at the periodic table, select the elements of IIIA group of the periodic table (Atomic numbers are given) –

• A. 3, 11, 19, 37
• B. 5,13, 21, 39
• C. 7, 15, 31, 49
• D. 5, 13, 31, 49

Answer 1

Answer: (D)

5, 13, 31, 49

Answer 2

III A group Ž ₅B, ₁₃Al, ₃₁Ga, ₄₉In, ₈₁Tl