The screening effect also called as shielding effect
A valence-electron in a multi-electron atom is attracted by the nucleus, and is repelled by electrons of the inner-shells. The collective effect of this attractive and repulsive force acting upon the valence-electron experiences less attraction from the nucleus. This is known as shielding or screening effect. The magnitude of screening effect depends upon the number of the inner electrons, that is higher the number of the inner electrons, greater will be the value of screening effect. The screening effect constant can be denoted by the symbol
can be determined by the Slater's rules.
Magnitude of the screening constant in case of the s- and p- block elements increases in the period as well as in the group as atomic number increases.
Effective nuclear charge
Because of the screening affect the valence electron experiences less attraction towards nucleus. This brings decrease in the nuclear charge (Z) actually present on the nucleus. The reduced nuclear charge is termed effective nuclear charge and is represented by Z+. It is related to actual nuclear charge (Z) by the following formula,
here is screening constant.
It is observed that magnitude of effective nuclear charge increases in a period when we move from left to right.
In the subgroup of ordinary elements the magnitude of effective nuclear charge remains almost the same.
Email based Chemistry assignment help - homework help at Expertsmind
Are you searching chemistry expert for help with Screening effect questions? Screening effect topic is not easier to learn without external help? We at www.expertsmind.com offer finest service of Chemistry assignment help and chemistry homework help. Live tutors are available for 24x7 hours helping students in their Screening effect related problems. We provide step by step Screening effect question's answers with 100% plagiarism free content. We prepare quality content and notes for Screening effect topic under chemistry theory and study material. These are avail for subscribed users and they can get advantages anytime.
Why Expertsmind for assignment help
- Higher degree holder and experienced experts network
- Punctuality and responsibility of work
- Quality solution with 100% plagiarism free answers
- Time on Delivery
- Privacy of information and details
- Excellence in solving chemistry queries in excels and word format.
- Best tutoring assistance 24x7 hours