Twenty Questions

1. Twenty Questions Atoms and Periodic Table Review

2. Twenty Questions

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

4. Where are electrons found? • Electron Cloud

5. 3. Protons have a _____ charge. • positive

6. 4.Neutrons have ___ charge. • no

7. 5.Electrons have a ____ charge. • negative

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

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

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

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

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

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

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

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

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

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

18. 16. Rows that run horizontally are called___ • periods

19. 17. Columns that run vertically are called___. • Groups or families

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

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

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