Question

1. how many valence electrons are in the following element?

a. f
b. cl
c. br
d. i
e. o
f. s
g. se
h. te

Explanation:

Step1: Recall valence - electron rule for group 17 and 16 elements

Elements in group 17 have 7 valence electrons and elements in group 16 have 6 valence electrons.

Step2: Identify group numbers of given elements

F, Cl, Br, I are in group 17. O, S, Se, Te are in group 16.

Step3: Determine number of valence electrons

a. F: 7
b. Cl: 7
c. Br: 7
d. I: 7
e. O: 6
f. S: 6
g. Se: 6
h. Te: 6

Answer:

a. 7
b. 7
c. 7
d. 7
e. 6
f. 6
g. 6
h. 6