How do we calculate the valency of an element from its electronic configuration?
Answers
Answer:
The valency of an element is determined by the number of valence electrons present in the outermost shell of its atom. The number of electrons lost or gained (or shared) by one atom of an element to achieve the nearest inert gas electron configuration, gives us the valency of the element
Explanation:
if valence electrons are 1234 the valency also 1,2,3,4
if valence electrons are 5678 valency is
3,2,1,0
Please mark as brainliest answer.
Answer:
1. First, write the electronic configuration of the element you want to know the valency of.
2. (i)For example, an element with atomic number 12 has an electronic configuration as follows:
K(2), L(8), M(2), N(0).
(ii) An element with atomic number 16 has an electronic configuration as follows:
K(2), L(8), M(6), N(0).
(iii) An element with atomic number 14 has an electronic configuration as follows:
K(2), L(8), M(4), N(0).
(iv) An element with atomic number 18 has an electronic configuration as follows:
K(2), L(8), M(8), N(0).
3. Now, know the Valence shell (last filled shell) to determine the valence electrons in it.
4. In the above examples,
(i) the valence shell is M with 2 eletrons in it.
(ii) the valence shell is M with 6 electrons in it.
(iii) the valence shell is M with 4 electrons in it.
(iv) the valence shell is M with 8 electrons in it.
5. An element with valence electrons less than 4, has valency as same as its number of valence electrons in positive.
6. An element with valence electrons more than 4 has its valency, the difference of number of valence electrons from 8 in negative.
7. An element with valence electrons exacly equal to 4 has valency of 4.
8. An element with valence electrons 2 or 8, has valency equal to 0.
9. On the basis of above criterias:
(i) The Element has a valency of "+2"
(ii) The Element has a valency of "–2"
(iii) The Element has a valency of "4"
(iv) The Element has valency of "0"