Question : The actinide series is a group of ______ metallic chemical elements.
Option 1: 12
Option 2: 15
Option 3: 9
Option 4: 18
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Correct Answer: 15
Solution : The correct answer is 15.
The actinide series is a group of 15 metallic chemical elements. This series is named after the first element in the series, which is actinium, and the last element in the series is lawrencium. The actinide series contains elements with atomic numbers from 89 to 103. These elements are radioactive and are placed in the third group of the periodic table.
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Question : Directions: Which of the following numbers will replace the question mark (?) in the given series? –15, –9, –3, 3, 9, 15, ?
Option 1: 24
Option 2: 30
Option 3: 21
Question : What is the total number of periods and groups in the Modern Periodic Table?
Option 1: Period:9 Group:7
Option 2: Period:18 Group:7
Option 3: Period:7 Group:9
Option 4: Period:7 Group:18
Question : Directions: Which two numbers should be interchanged to make the given equation correct? 9 + 30 × 15 – 18 ÷ 6 = 274
Option 1: 18 and 9
Option 2: 30 and 18
Option 3: 15 and 18
Option 4: 9 and 30
Question : If x : y : z = 2 : 3 : 4, then what is the value of 7x : 3y : 2z?
Option 1: $14:9:8$
Option 2: $18:7:12$
Option 3: $12:6:11$
Option 4: $16:9:8$
Question : Directions: In the following question a series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series. 56, 42, 30, 20, ?, 6
Option 1: 15
Option 2: 12
Option 3: 18
Option 4: 14
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