While preparing a presentation about the element helium, a student took the following notes:
- Helium was first detected in the Sun's spectrum before it was found on Earth.
- In 1868, astronomers Pierre Janssen and Norman Lockyer independently observed a yellow spectral line in sunlight.
- Lockyer named the element "helium" after Helios, the Greek god of the Sun.
- In 1895, chemist William Ramsay successfully isolated helium on Earth.
The student wants to emphasize when helium was first isolated on Earth. Which choice most effectively uses information from the given notes to accomplish this goal?
- In 1895, chemist William Ramsay successfully isolated helium on Earth.Answer
- BIn 1868, astronomers Pierre Janssen and Norman Lockyer detected helium by observing a yellow line in the solar spectrum.
- CHelium was first isolated on Earth in 1868, shortly after Norman Lockyer named the element after the Greek god Helios.
- DWilliam Ramsay likely suspected that helium existed on Earth before he isolated the element in 1895.
Answer
In 1895, chemist William Ramsay successfully isolated helium on Earth.
The correct option successfully addresses the writing goal by identifying the specific year (1895) helium was first isolated on Earth based on the notes.
Step-by-Step Solution
Key Concept
Rhetorical Synthesis: Emphasizing Specific Details