Chemistry

4. A positive subatomic particle found in the nucleus.
6. The number of protons found in the nucleus of an atom.
8. A change in a substance that does not alter its chemical composition, like melting ice. (2 words)
10. Discovered the nucleus using the Gold Foil Experiment. (Last name)
12. The dense, positively charged center of an atom.
14. A property that describes a substance's ability to undergo a change in its chemical composition, such as flammability. (2 words)
15. Proposed the Plum Pudding Model where negative particles were embedded in a positive sphere.

1. Proposed that electrons orbit the nucleus in specific energy levels, like planets around the sun.
2. A negative subatomic particle found orbiting the nucleus.
3. A new substance is formed with different properties, such as burning wood. (2 words)
5. A subatomic particle with no electrical charge, found in the nucleus.
6. The smallest unit of an element that retains the properties of that element.
7. A fundamental property of matter that can be observed or measured without changing the substance's identity, such as color or density. (2 words)
9. The theory that all matter is composed of small particles called atoms. (2 words)
11. Proposed that matter is made of indivisible, indestructible particles called atomos. (Last name)
13. Developed the Modern Atomic Theory stating that all atoms of the same element are identical.