Top answers

Why does boiling point decrease down group 1 in the periodic table? [3 marks]

Atomic radius increases Although nuclear charge increases, this is outweighed by the increased shielding from inner shell electrons Therefore, nuclear attraction to the delocalised electrons decreases (metal...
Answered by • Chemistry tutor
3870 Views

What is the difference between a sigma and pi bond? Use your answer to explain why there is fixed rotation about the C=C bond.

What is an atomic orbital? Electrons are not entirely confined within the atom. An orbital is the defined space around the central nucleus of an atom where electrons are predicted to be. Each can contain a m...
CM
Answered by Chenai M. • Chemistry tutor
5468 Views

Describe and explain the trend in atomic radii across the periodic table

Atomic radii decreases in size, moving from left to right in the periodic table. This is because atoms on the right hand side of a period have a larger number of protons. So, there is a greater positive char...
Answered by • Chemistry tutor
2823 Views

Explain why the first ionisation energy of Al is less than that of Mg?

The outer electron on aluminium is removed from the 3p sub-level, whereas the outer electron on magnesium is removed from the 3s sub-level.The 3p sub-level is higher in energy than the 3s sub-level.Aluminium...
Answered by • Chemistry tutor
29852 Views

Why does calcium nitrate decompose in a similar way to magnesium nitrate, but require a higher temperature for decomposition?

Calcium ions (Ca 2+ ) have the same charge as magnesium ions (Mg 2+ ) but Ca 2+ ions have a larger ionic radius (as ionic radius increases down the group). This means Ca 2+ has a lower charge density than Mg...
KA
Answered by Keziah A. • Chemistry tutor
8228 Views