Chemistry Vocabulary Crossword

2. a formation when an atom loses or gains one or more electrons.
6. less reactive than an Alkali Metal and are known to be earth metals.
11. a metal that is less reactive and remain unchanged and are the earliest among metals.
13. elements in Group 18 that never react with other elements.
15. when an electron is added to the original atom.
16. a series of radioactive elements ,90-103,that are separated from the rest of the periodic table.
19. a column in the periodic table that is read top to bottom.
20. when an electron is lost from the atom and there are more protons than electrons.
21. a metal that is very reactive, to oxygen and water vapor, and belongs in Group 1.
23. elements that conduct electricity and heat well and have a shiny appearance.
24. a measure of atomic mass in an element.

1. a negatively charged particle.
3. an uncharged particle.
4. elements that have properties of both metals and nonmetals.
5. the center of an atom.
7. a positively charged particle.
8. a row in the periodic table that is read left to right.
9. elements in Group 17 that are very reactive nonmetals that easily form compounds called salts with many metals.
10. when the identity of the atom changes due to the number of protons changing to create a new elements.
12. a crowd of electrons moving around the nucleus.
14. a series of metallic elements ,58-71,that are separated from the rest of the periodic table.
17. an element with a dull surface and are poor conductors of electricity and heat, opposite of a metal.
18. when atoms produce energy and particles from the nuclei to create new atoms of different elements.
21. the number of protons in the nucleus of the element.
22. atoms of the same element that have a different number of neutrons.