Question

Arrange the following elements in decreasing order of their abundance in the universe:
A. H,
B. He,
C. N,
D. O, E. Ne. Choose the correct answer from the options given below:

• A. B, A, C, D, E
• B. A, B, D, E, C
• C. A, B, E, D, C
• D. B, A, D, C, E

Hint:

Universal abundance generally starts with Hydrogen, then Helium, followed by heavier elements such as Oxygen and Neon.

Answer 1

The Correct Option is B

Concept:
The abundance of elements in the universe is dominated by light elements. Hydrogen is the most abundant element, followed by helium.

Step 1: Identify the most abundant element.
Hydrogen is the most abundant element in the universe. \[ \text{Hydrogen}=A \] So, \[ A \text{ comes first} \]

Step 2: Identify the second most abundant element.
Helium is the second most abundant element. \[ \text{Helium}=B \] So, \[ B \text{ comes after } A \]

Step 3: Compare oxygen, neon and nitrogen.
Among oxygen, neon and nitrogen, oxygen is more abundant than neon and nitrogen. Neon is generally more abundant than nitrogen in cosmic abundance. \[ O>Ne>N \] Using the given letters: \[ D>E>C \]

Step 4: Final decreasing order.
Therefore, the decreasing order is: \[ H>He>O>Ne>N \] \[ A>B>D>E>C \] \[ \therefore \text{Correct Answer is (B)} \]