1. Properties of Atoms and the Periodic Table
General Science
Study Guide

2. True/False for numbers 1-20
True/False for numbers If it false, please supply the correct answer The central core of an atom is called the hub.
atom

3. 2. The chart showing the classifications of elements according to their properties and increasing atomic numbers is called the periodic table.

4. 3. The mass of an electron is about equal to the mass of a proton.
neutron

5. 4. Elements arrange in vertical columns in the periodic table are called periods.
Groups or
families

6. 5. The region around the nucleus occupied by the electrons is called the negative zone.
cloud

7. 6. The symbol for chlorine is C.Cl

8. 7. The maximum number of electrons in the second energy level of an atoms is 48

9. 8. Two isotopes of carbon are carbon-12 and carbon-14
8. Two isotopes of carbon are carbon-12 and carbon-14. These isotopes differ from one another by two electrons.
neutrons

10. 9. Nonmetals are poor conductors of heat and electricity.

11. 10. Seven electrons in the outermost energy level is characteristic of a metal.
nonmetal

12. 11. Quarks can be produced by bombarding protons with protons.

13. 12. The number of protons in an atom is called the atomic mass.

14. 13. The sum of the number of protons and the number of neutrons in an atoms if the mass number.

15. 14. The weighted average of the mass numbers of all the isotopes that occur in nature for a particular element is the average atomic number.
Atomic
mass

16. 15. A diagram showing only outer energy level electrons is called a(n) periodic table.
dot diagram

17. 16. Elements having three or fewer electrons in the outer energy level are classified as nonmetals.

18. 17. The atomic masses of the elements are not whole value numbers because of the existence of quarks.
isotopes

19. 18. The identify of an element is determined by the number of protons.

20. 19. According to present atomic theory, the location of an electron in an atom is best represented by a probability cloud.

21. 20. As you move from left to right in a row of the periodic table, metallic properties increase.
decrease

22. 21. Each energy level of an atom has a maximum number of _____ it can hold.
electrons

23. 22. Dot diagrams are used to represent.
Outer electrons

24. 23. Particles of matter that make up protons and neutrons are ________.
quarks

25. 24. A chemical symbol represents the _____ of an element.
name

26. 25. Horizontal rows of the periodic table are called _______.
periods

27. 26. Atoms of the same element with different numbers of neutrons are called________.
isotopes

28. 27. A particle that moves around the nucleus is a(n)
electron

29. 28. Elements in groups 3 through 12 are called _____.
Transition elements

30. 29. The ____ is used to accelerate protons in the study of subatomic particles.
Tevatron

31. 30. A certain atom has 26 protons, 26 electrons, and 30 neutrons
30. A certain atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is ____
56 protons + neutrons

32. 5 points Explain why the elements in group 18 are stable.
The atoms in Group 18, except helium, have outer energy levels that contain eight electrons.