Across
- 2. The columns on a periodic table that arrange the elements by select characteristics.
- 4. The number of protons (positive charges) in an atomic nucleus.
- 6. Water is made up of the elements hydrogen and oxygen.
- 8. Only a small number of different elements comprise the majority of matter found in Earth's systems.
- 9. The rows in a periodic table that classify the elements by select characteristics.
- 11. A shorthand notation that uses chemical symbols and numbers as subscripts to represent the type of atoms and number of atoms that are present in the smallest unit of the substance.
- 13. The process by which one or more substances change to produce one or more different substances.
- 14. Cells from living matter are made of carbon bonded to other elements, such as hydrogen, oxygen, phosphorus, nitrogen, calcium, or sulfur.
- 15. Matter that is composed of two or more elements that are chemically combined.
- 16. A pure substance that cannot be separated into simpler substances by physical or chemical means.
- 17. Matter that is made up of the same particles throughout.
- 18. Anything that has volume and mass.
Down
- 1. Those characteristics that can be observed without changing the identity of the substance such as size, shape, luster, conductivity, malleability, and magnetic attraction.
- 3. Oxygen and silicon are the main elements of matter that make up the rock and minerals of Earth's crust.
- 5. The symbol that represents each element on the periodic table.
- 7. An arrangement of the elements according to their atomic numbers and periodic trends of physical and chemical properties.
- 10. The smallest unit of an element that has all of the properties of that element.
- 12. A mixture of mainly nitrogen and oxygen, with small amounts of other gases that surround Earth.