Across
- 2. Chemical symbol Au
- 4. The ______ number is located above the element’s symbol
- 7. A substance made up of two or more types of atoms
- 8. The name of a horizontal line on the Periodic Table
- 9. A grid like structure made up of atoms
- 10. Is the 26th element of the periodic table
- 11. Has a chemical symbol of K
- 12. Ion with negative charge
- 14. The atomic mass is made up of the number of protons and ______
- 16. Name for electron shells
- 18. The second electron shell holds ______ electrons
- 19. Protons, neutrons and electrons are all ______ particles
- 21. An atom with positive or negative charge
- 23. Float around the nucleus in shells
- 25. The atomic number is the number of ______ in an atom's nucleus
- 26. Element with 9 protons
- 31. A group of atoms that are bonded together
- 32. The compound water is made up of 2 hydrogen atoms and 1 ______ atom
- 34. Has the chemical symbol Be
- 36. Sodium and ______ make up salt (NaCl).
- 38. The periodic table was developed by ______ Mendeleev
Down
- 1. The atom that becomes the ion, Cr3+
- 3. Has an electron configuration of 2,8,2
- 5. Another name for the outer shell of an atom
- 6. First element on the periodic table
- 11. Mendeleev was able to predict ______ of undiscovered atoms
- 13. Non-reactive atoms have a ______ outer shell
- 15. The name of a vertical line on the Periodic Table
- 17. Nitrogen has ______ electrons
- 19. Sulfur has ______ electrons in its outer shell
- 20. Ion with positive charge
- 22. Element with atomic number of 10
- 24. Has a chemical symbol of Ag
- 27. Ions are formed when an atom gains or ______ electrons
- 28. The inside part of an atom that houses subatomic particles
- 29. A substance made up of only one type of atom
- 30. Smallest building block of matter
- 33. The elements are arranged in ______ order
- 35. There are 118 elements on the ______ table
- 37. A group of atoms that have not been chemically bonded