John Newland arranged the element starting with hydrogen and ending with _______.

Explanation

To solve the question, we need to identify the last element in John Newland's arrangement of elements, which starts with hydrogen.

### Step-by-Step Solution:

1. **Understanding Newland's Arrangement**:
- John Newland arranged the elements based on their increasing atomic masses.
- He is known for the Law of Octaves, where he noted that elements with similar properties appeared at intervals of eight when arranged by atomic mass.

2. **Starting Element**:
- The arrangement begins with hydrogen, which is the lightest element with the lowest atomic mass.

3. **Ending Element**:
- According to historical records, Newland's arrangement concluded with thorium.
- Thorium has an atomic mass of approximately 232.

4. **Conclusion**:
- Therefore, the complete statement is: "John Newland arranged the elements starting with hydrogen and ending with thorium."

### Final Answer:
John Newland arranged the elements starting with hydrogen and ending with **thorium**.

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