The most recent discovery among the options provided is the Neutron. Here's a brief timeline:

1. Oxygen: Oxygen was discovered by Carl Wilhelm Scheele, a Swedish chemist, in 1772.
2. Chemical reactions: The concept of chemical reactions dates back to ancient times, but the first scientific understanding of them came in the late 18th century with Antoine Lavoisier's law of conservation of mass.
3. Atomic number: The concept of atomic number was first proposed by the British chemist Henry Moseley in 1913.
4. Neutrons: The neutron was discovered by James Chadwick, an English physicist, in 1932.

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The most recent discovery among the options provided is the Neutron. Here's a brief timeline:

1. Oxygen: Oxygen was discovered by Carl Wilhelm Scheele, a Swedish chemist, in 1772.
2. Chemical reactions: The concept of chemical reactions dates back to ancient times, but the first scientific understanding of them came in the late 18th century with Antoine Lavoisier's law of conservation of mass.
3. Atomic number: The concept of atomic number was first proposed by the British chemist Henry Moseley in 1913.
4. Neutrons: The neutron was discovered by James Chadwick, an English physicist, in 1932.

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The most recent discovery among the options provided is the Neutron. Here's a brief timeline:

1. Oxygen: Oxygen was discovered by Carl Wilhelm Scheele, a Swedish chemist, in 1772.
2. Chemical reactions: The concept of chemical reactions dates back to ancient times, but the first scientific understanding of them came in the late 18th century with Antoine Lavoisier's law of conservation of mass.
3. Atomic number: The concept of atomic number was first proposed by the British chemist Henry Moseley in 1913.
4. Neutrons: The neutron was discovered by James Chadwick, an English physicist, in 1932.

Which one of the following was the most recent discovery? Neutrons Chemical reactions Oxygen Atomic number

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