SCIENCE
PHYSICAL SCIENCES
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
What is the valence electron of Thalium?
|
|
7
|
|
|
5
|
|
|
3
|
|
|
1
|
Explanation:
Detailed explanation-1: -Only two electrons are present and the last shell is 1s and there are 2 electrons present in it, so the number of valence electrons is 2.
Detailed explanation-2: -Gallium therefore has three valence electrons.
Detailed explanation-3: -Therefore, Helium has two valence electrons and has a valency of zero.
Detailed explanation-4: -Since helium atoms only have two electrons and the outermost energy level is the first energy level, there can only be two valence electrons.
There is 1 question to complete.