1. Give the symbols of two elements in the fourth period:

    Any two of the following:

K

Ca

Sc

Ti

V

Cr

Mn

Fe

Co

Ni

Cu

Zn

Ga

Ge

As

Se

Br

Kr

2. Give the symbols of two transition metals:

    Any two of the following:

Sc		Ti	V	Cr	Mn	Fe	Co	Ni	Cu	Zn
Y		Zr	Nb	Mo	Tc	Ru	Rh	Pd	Ag	Cd
La	*	Hf	Ta	W	Re	Os	Ir	Pt	Au	Hg
Ac	§

3. Give the symbols of two inert gases:

    Any two of the following:

He

Ne

Ar

Kr

Xe

Rn

4. Give the symbol of an element similar in properties to Br:

    Any of the other halogens: F, Cl, I, At

5. Give the symbol of the element in the third period and second group: 

    Mg

6. Is Zn a metal or nonmetal? 

    metal

7. How many valence electrons does Na have? 

    one

8. How many valence electrons does Cl have?  Draw the Lewis structure (dot diagram) for it.

    seven          . .

                   :  Cl   :

                        ^.

9. What is the outermost electron structure for Co? 

    3d⁷

10. Which atom is larger--Sr or Ca? 

    Sr

11. Why? 

    It has more electron energy levels.

12. What is ionization energy?

    It is the energy required to remove one electron from an atom.

13. Which has the higher ionization energy--Na or Mg?

    Mg

14. Why?

    It has a higher effective nuclear charge (and the valence electrons are in the same energy level).

15. Which has more attraction for its valence electrons--F or Cl?

    F

16. Why?

    It has fewer energy levels, thus the electrons are closer to the nucleus (and they have the same effective nuclear charge).

 

17. Metals react by __losing__ electrons.

18. Which is more reactive--K or Li?

    K  

19. Nonmetals react by __gaining__ electrons.

20. Which is more reactive--Cl or S?

    Cl

E-mail instructor: Eden Francis Science Department 19600 South Molalla Avenue Oregon City, OR 97045 (503) 594-3352 TDD (503) 650-6649

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©1998, 2002 Clackamas Community College, Hal Bender