Question : Which of the following elements is a member of the actinoid series?
Option 1: Magnesium
Option 2: Lanthanum
Option 3: Lutetium
Option 4: Thorium
Correct Answer: Thorium
Solution : The correct option is Thorium.
Thorium (Th) is a member of the actinide series. It is located just above uranium in the periodic table and is part of the actinide series due to its electronic configuration and properties associated with the filling of the 5f orbitals. Thorium is a chemical element with the symbol Th and the atomic number 90. It is not as reactive as uranium and tarnishes slowly in the air.
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Question : Which of the following is a radioisotope of hydrogen?
Option 1: Xenon
Option 2: Technetium
Option 3: Thorium
Option 4: Tritium
Question : Which of the following is radioactive?
Option 1: Helium
Option 2: Sodium
Option 4: Platinum
Question : Which of the following elements is obtained from seaweeds?
Option 1: Iodine
Option 2: Vanadium
Option 3: Argon
Option 4: Sulphur
Question : Which among the following combinations is present in higher amounts in hard water?
Option 1: Calcium and Magnesium
Option 2: Calcium and Sodium
Option 3: Sodium and Magnesium
Option 4: Sodium and Manganese
Question : Directions: In the following question a series is given, with one number missing. Select the missing number from the given series. ?, 5, 15, 45, 113
Option 1: 1
Option 2: 2
Option 3: 3
Option 4: 4
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