1. How can the periodic table be used to determine the number of valence electro

Question

1. How can the periodic table be used to determine the number of valence electrons in a representative element atom?

2. How many total electrons and valence electrons are found in an atom of each of the following elements? What is the number of the principal energy level in which the valance electrons are found?

b. K

d. Br

f. Xe

3. Determine the number of protons and electrons in each of the following ions.

a. S2-

b. K+

c. Cd2+

4. Arrange each of the following lists of elements in order of increasing atomic size:

Al, Si, P, Cl, S

Sr, Ca, Ba, Mg, Be

Explanation / Answer

1. In periodic table elements are classified in groups and periods. From knowledge of group number we can predict number of valence electrons.

Group-1:- 1 valence electron

Group-2:- 2

Group-13:-3

Group-14:-4

Group-15:-5

Group-16:-6

Group-17:-7

Group-18:-8

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