Who observed helium first on the earth?

Options

A. Lothar meyer
B. Ramsay
C. Sheele
D. Rutherford

Answer

To answer the question "Who observed helium first on the earth?" we can follow these steps:

### Step 1: Identify the Context of Helium's Discovery
Helium was first discovered in the context of studying certain natural phenomena, particularly related to radioactivity.

**Hint:** Consider the relationship between helium and alpha particles.

### Step 2: Recognize the Key Figure in Helium's Discovery
The first person to observe helium on Earth was Sir William Ramsay. He is known for his work with gases and played a significant role in the study of noble gases.

**Hint:** Think about who is often associated with the discovery of noble gases.

### Step 3: Understand the Method of Observation
Ramsay observed helium while studying clevitate (a mineral) and the alpha particles emitted from radioactive materials. The alpha particles were identified as helium nuclei, which are essentially helium ions (He²⁺) when both electrons are removed.

**Hint:** Consider what alpha particles are and their connection to helium.

### Step 4: Conclude the Answer
Based on the observations and studies conducted by Ramsay, he is credited with the first observation of helium on Earth.

**Final Answer:** Sir William Ramsay is the scientist who first observed helium on Earth.

### Summary of Steps:
1. Identify the context of helium's discovery.
2. Recognize Sir William Ramsay as the key figure.
3. Understand the method of observation involving alpha particles.
4. Conclude that Ramsay is credited with the observation of helium.