What is the trend in first ionisation energy across a period?

Overall, the general trend is an increase across the period.

The decrease in shielding (as outer electrons are less influenced by the nucleus) is outweighed by an increased nuclear charge and a decreased atomic radius.

However, the value actually decreases between group 2 and 3. This is a result of the electronic configurations of these elements. The outermost electron in Be (in a 2s orbital) is less easily removed than that of B (in a 2p orbital). The same occurs from group 5 and 6.

BW
Answered by Ben W. Chemistry tutor

11953 Views

See similar Chemistry GCSE tutors

Related Chemistry GCSE answers

All answers ▸

What is the mass (in grams) of 0.1 moles of CaCO3?


When nitrogen and hydrogen react in the Haber process the reaction can reach a dynamic equilibrium. Explain what is meant by the term dynamic equilibrium.


A metal oxide has a relative formula mass (Mr ) of 81. The formula of this metal oxide is MO. Given that the relative atomic mass (Ar ) of oxygen is 16, what is the metal in the metal oxide?


Why does increasing temperature increase the rate of reaction?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences