Periodic Table, Atoms, and Isotopes Review

Directions

Use these questions to help you to review and guide your study.

Study Questions

1. Which has the fewest valence electrons?

Helium

Xenon

Oxygen

Nitrogen

2. Which element is NOT in the same group as phosphorus?

Antimony

Arsenic

Nitrogen

Oxygen

3. Which is a liquid at room temperature?

Sodium

Uranium

Argon

Mercury

Study Questions

4. Fluorine, Bromine, Chlorine, Iodine, and Astatine have the same valence. To which group do these elements belong?

Alkali metals Alkaline earth metals Halogens Noble gases

5. The order of elements in the periodic table is based on The number of protons in the nucleus The electric charge of the nucleus The number of neutrons in the nucleus Atomic mass

6. Which of the following elements is an alkali metal? Calcium Magnesium Mercury Sodium

Study Questions

7. As you move from left to right across the periodic table, elements

Become less metallic

Have a lower atomic number

Have a lower atomic weight

Become more metallic

8. Most elements are

Metals

Nonmetals

Metalloids

Shiny

9. The order of elements in the modern periodic table is based on an element’s

Atomic number

Name

Chemical symbol

Atomic mass

Study Questions

10. Different isotopes of the same element have different Atomic numbers

Numbers of neutrons

Numbers of protons

Numbers of electrons

11. Which pair of elements would most likely have a similar arrangement of outer electrons and have similar chemical behaviors?

Boron and aluminum

Helium and fluorine

Carbon and nitrogen

Chlorine and oxygen

Study Questions

12. What is the maximum number of electrons that can fit into the second shell?  2

 8

 18

13. What atom has the electron configuration 2,8,5?  Phosphorus

 Silicon

 Aluminium

14. Which atom is the most stable: F, Ne, Na?  F

 Ne

 Na

Study Questions

15. Which of these elements has two electrons in its outer shell?  Ba

 Pb

 At

16. Which of these elements has three electron shells?  Boron

 Silicon

 Potassium

17. What is the electron configuration of calcium?  2,8,8

 2,8,8,1

 2,8,8,2

Answers

1. helium

2. oxygen

3. mercury

4. halogens

5. The number of protons in the nucleus

6. sodium

7. Becomes less metallic

8. metals

9. atomic number

10. Numbers of neutrons

11. boron and aluminum

12. 8

13. phosphorus

14. neon

15. Ba

16. silicon

17. 2,8,8,2