Crossword

2. Those characteristics that can be observed without changing the identity of the substance such as size, shape, luster, conductivity, malleability, and magnetic attraction.
7. The process by which one or more substances change to produce one or more different substances.
9. The number of protons (positive charges) in an atomic nucleus.
10. Only a small number of different elements comprise the majority of matter found in Earth's systems.
11. Cells from living matter are made of carbon bonded to other elements, such as hydrogen, oxygen, phosphorus, nitrogen, calcium, or sulfur.
13. Matter that is made up of the same particles throughout.
14. Anything that has volume and mass.
15. The columns on a periodic table that arrange the elements by select characteristics.
16. Water is made up of the elements hydrogen and oxygen.

1. A pure substance that cannot be separated into simpler substances by physical or chemical means.
2. An arrangement of the elements according to their atomic numbers and periodic trends of physical and chemical properties.
3. The rows in a periodic table that classify the elements by select characteristics.
4. 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.
6. Matter that is composed of two or more elements that are chemically combined.
7. 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.
8. 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.