Periodic Table

2. The method by which elements are grouped on the basis of their characteristics.
3. A positively charged particle that resides within the atomic nucleus.
4. Atoms are composed of protons, neutrons, and electrons, which are composed of the basic building blocks of matter.
6. The first element of the periodic table as its atomic number is one.
10. The chemical elements are what the periodic table classifies and organizes.
11. chemical element of the alkali metal group of the periodic table.
12. A substance made up of two or more different chemical elements combined in a fixed ratio.
13. A transition metal, grouped with cadmium and mercury.
15. A chemical element with the symbol (HE) and atomic number 2.
16. A particle of matter that uniquely defines a chemical element.
18. A chemical element with symbol ( CA ) and atomic number 20.
19. A chemical element with the symbol (N) and atomic number 7.

1. Table organizes all discovered chemical elements in rows and columns according to increasing atomic numbers.
2. A chemical element with the symbol ( C ) and atomic number.
5. The vertical columns on the periodic table are called groups or families because of their similar chemical behavior.
7. A substance that contains only one type of atom.
8. The number of electrons will equal the number of protons.
9. The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows
14. The important characteristics of an element in the periodic table are its atomic symbol, atomic number and mass number.
17. A one or two letter symbol that represents the element.