Q. Difference between occupied level of Mercury and an unoccupied higher level is 5 electron volt .An electron having an energy of 5.0 electron volt passes through Mercury vapour find the wavelength of emitted radiation .
Answers
Answer:
The thing to remember about a main-group element is that the group number tells you the number of valence electrons said element has.
Main-group elements are located in groups
1
,
2
and
13
through
18
. In your case, the group number is given using the old notation that makes use of Roman numerals to distinguish between main groups,
A
, and transition elements,
B
.
You thus have
Group 1
→
Group 1A
Group 2
→
Group 2A
Group 13
→
Group 3A
Group 14
→
Group 4A
Group 15
→
Group 5A
⋮
and so on.
Now, your element is said to be located in group
5
A
, i.e. group
15
. For this group, the number of valence electrons is listed in the group number
Group
a
5
A
→
5
a
valence electrons
Group 1
5
→
5
a
valence electrons
As you know, an element's valence electrons are simply the electrons located on the outermost energy level, i.e. on the highest occupied energy level.
Therefore, you can say that an element located in group. A has 5 electrons on its highest occupied energy level.
ur ans....... above attachment .....
