Across
- 5. Are found to the right of the stair step line, most are gas at room temperature.
- 13. A shorthand that scientists use to describe a chemical reaction.
- 14. The recipe for a chemical substance. Tells the number of atoms of each element in a compound or molecule
- 16. A combination of many different elements, not chemically combined, can be separated
- 18. Elements on both sides of the Boron stair-step zigzag line that have properties of both metals and nonmetals.
- 19. The basic building blocks of ordinary matter
- 20. No electrical charge
Down
- 1. Small numbers found in some chemical formulas that tell you the number of atoms of each element present, if there is not a number it is understood as 1
- 2. 2 or more atoms (the same type of atom O2, or different atoms H2O) bonded together, Represents the smallest particle in a chemical compound that can take place in a chemical reaction
- 3. The number in front of the element symbol that indicates the number of molecules in a chemical equation. If there is not one in front of a molecule, it is an understood 1.
- 4. Changes the form or appearance of a substance. Does not change substance into anything new.
- 6. Anything that has mass and takes up space
- 7. 88 elements to the left of the stair step line; most are solid at room temperature.
- 8. Positively charged subatomic particle +
- 9. Negatively charged subatomic particle –
- 10. Occurs when two or more molecules interact and the molecules change into a new substance. Bonds between atoms are broken and created to form new molecules.
- 11. A pure substance that cannot be broken down into any other substance
- 12. Has a definite and constant composition, can be either an element or compound
- 15. The amount of matter in a particle or object
- 17. A pure substance formed when two or more elements have chemically combined through a chemical reaction to form a new substance It is represented by a formula