The first spectral series was discovered by

Options

A. balmer
B. lyman
C. paschen
D. Pfund

Explanation

To solve the question about who discovered the first spectral series, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Context**: The question asks about the discovery of the first spectral series. Spectral series refer to the lines in the spectrum of light emitted or absorbed by atoms.

2. **Recall Historical Figures**: We need to think about scientists who contributed to the understanding of spectral series. One prominent figure in this area is Johann Jakob Balmer.

3. **Research Balmer's Contribution**: Johann Jakob Balmer, a Swedish schoolteacher, is known for discovering the Balmer series in 1825. This series corresponds to the visible spectrum of hydrogen.

4. **Confirm the Details**: The Balmer series is part of the hydrogen emission spectrum and includes wavelengths that fall within the visible range, making it significant in the study of atomic structure.

5. **Select the Correct Answer**: Based on the information gathered, the correct answer to the question is Johann Jakob Balmer.

### Final Answer:
The first spectral series was discovered by Johann Jakob Balmer.

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