2. Twenty Questions Atoms and Periodic Table Review

3. Twenty Questions 12345 678910 1112131415 1617181920

4. 1. What subatomic particles are found in the nucleus of an atom? Protons and Neutrons

5. Where are electrons found? Electron Cloud

6. 3. Protons have a _____ charge. positive

7. 4.Neutrons have ___ charge. no

8. 5.Electrons have a ____ charge. negative

9. 6.How do you find the atomic mass of an atom? Add the protons and neutron

10. 7.The number of protons in the nucleus is the ____ of an atom. Atomic number

11. 8.What is the mass number of an atom that has 4 protons, 4 electrons, and 3 neutrons. 7

12. 9. An atom has no overall charge because it has equal number of __ and ___. Protons and electrons

13. 10.How many protons does an atom with an atomic number of 23 and a mass number of 51 have? 23

14. 11. What determines the identity of an element? Atomic number

15. 12. Isotopes exist because atoms of the same element can have different number of ___. neutrons

16. 13. What is the significance of the zigzag line on the periodic table? It divides the metals from the nonmetals.

17. 14. You find metals on the ___ of the zigzag line. left

18. 15. You find nonmetals on the ___ of the zigzag line. right

19. 16. Rows that run horizontally are called___ periods

20. 17. Columns that run vertically are called___. Groups or families

21. 18. The ___ corresponds to the number of energy levels an atom has. Period number

22. 19. Elements in the same ___ share similar properties. Group or family

23. 20. How many valence electrons does an atom of the element have that is in group 18 have? 8.