Please explain to me the reason why valency across a period first increases and then decreases
Asked by joshiraghavendra53 | 27th Feb, 2015, 01:40: PM
Expert Answer:
As we move from left to right in a period, the number of valence electrons in electrons increases from 1 to 8. The elements in a period have consecutive atomic numbers.
Valency is the number of electrons present in the outermost shell of an orbital.
On moving from left to right in each period, the valency increases from 1 to 4 and then decreases to zero.
Third period
Na
Mg
Al
Si
P
S
Cl
Ar
Valency
1
2
3
4
3
2
1
0
As we move from left to right in a period, the number of valence electrons in electrons increases from 1 to 8. The elements in a period have consecutive atomic numbers.
Valency is the number of electrons present in the outermost shell of an orbital.
On moving from left to right in each period, the valency increases from 1 to 4 and then decreases to zero.
|
Third period |
Na |
Mg |
Al |
Si |
P |
S |
Cl |
Ar |
|
Valency |
1 |
2 |
3 |
4 |
3 |
2 |
1 |
0 |
Answered by Arvind Diwale | 1st Mar, 2015, 11:55: AM
Related Videos
- How can we determine the valency of transition elements
- Please answer the 17
- How does the atomic size vary across a period ? Give reason.
- who gave modern periodic table
- What are isobars?
- How to find valency
- which is modern perodic law ?
- find the odd man out and state its reason helium,radon,argon,boron
- how to remember the valancies of elements?
- How many groups and periods were in Mendeleev's periodic table?
Kindly Sign up for a personalised experience
- Ask Study Doubts
- Sample Papers
- Past Year Papers
- Textbook Solutions
Sign Up
Verify mobile number
Enter the OTP sent to your number
Change