Across
- 3. Proposed the concept of wave-particle duality in 1924, suggesting that matter, like electrons, possesses wave-like properties in addition to particle-like properties
- 4. Known as the “laughing philosopher”Was one of the two founders of ancient atomist theoryHypothesized that matter is composed of tiny indivisible particles called “atoms” that move in a void Introduced the concept of “void” (suggesting that atoms are separated by an infinite amount of space)
- 6. Quatum theory (1900) - Model that said energy is released in groups called quanta instead of being released continuously Work is explain/backed by black-body radiation.
- 7. Developed the quantum mechanical model and wave equation which said electrons were more like waves than fixed particles Laid the foundation for understanding atomic structure and chemical bonding Put a lot of other scientist work about the atom together
- 9. Proposed the first scientific model for atoms in the early 19th centuryHe believes all matter is composed of tiny, indivisible atoms that differ in mass and properties based on their element Because of his observations of gases and laws of chemistry like the law of conservation of mass, Dalton proposed the modern theory of the atom in 1804.Published his atomic theory in 1808
- 11. The discovery of the atomic nucleus and the concept of the atom as mostly empty space, through a famous gold experiment he conducted.He discovered the proton and achieved the first artificial nuclear reaction, transforming nitrogen into oxygen, overwhelming it with alpha particles Rutherford’s work laid the foundation for the modern model of the atom
- 12. Discovered the new elements polonium and radium, and demonstrating that radiation originates from within the atom itself, not its chemical bonds Proved atoms were not indivisible and could transform, challenging the existing atomic model and laying the foundation for future discoveries in nuclear physics Coined the term radiology
Down
- 1. Discovered the electron in 1897 He proposed the Plum Pudding Model, the first atomic model with subatomic particles, suggesting that negative electrons were embedded in a sphere of charge
- 2. Proving that the charge of an electron is a discrete, universal, constant This helped provide evidence for the atomic nature of electricity and matter through his famous oil drop experiment This measurement was crucial for confirming atomic theory, as it quantified the fundamental charge of the electron
- 5. Developed matrix mechanics and articulated the Uncertainty Principle, which said that it is impossible to know both the precise position and momentum of a subatomic particle at the same time
- 8. Discovered the neutron This discovery led to a more complete atomic model, explaining anomalies in previous models and demonstrating how, in neurons, the lack of charge makes it an ideal tool for overwhelming atomic nuclei
- 10. Danish Physicist First to apply the Quatum concept and received a nobel peace prize in 1922Bohr Model (1913)- Model that said atoms have a heavier postive charge with a lighter negative charge