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A Level Chemistry
In a solid metal, each atom becomes a cation, donating its outer shell electrons to a ‘sea’ of delocalised electrons which are free to move throughout the whole structure.
The strong electrostatic forces of attraction between the cations and the delocalised electrons is metallic bonding.
116
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A Level Biology
Companion cells act as the “life support” for sieve tube elements, carrying out the living functions. They contain dense cytoplasm, a large nucleus, and many mitochondria, and are connected to the sieve tube elements via plasmodesmata.
86
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A Level Physics
A black body radiator is a theoretical object that absorbs and emits radiation at all wavelengths. While true black bodies are ideal and do not exist in reality, stars provide the closest real-world approximation.
The spectrum of radiation emitted by a black body is determined solely by its temperature.
43
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A Level Chemistry

In a solid metal, each atom becomes a cation, donating its outer shell electrons to a ‘sea’ of delocalised electrons which are free to move throughout the whole structure.

The strong electrostatic forces of attraction between the cations and the delocalised electrons is metallic bonding.

116

Read study notes

A Level Biology

Companion cells act as the “life support” for sieve tube elements, carrying out the living functions. They contain dense cytoplasm, a large nucleus, and many mitochondria, and are connected to the sieve tube elements via plasmodesmata.

Read study notes

A Level Physics

A black body radiator is a theoretical object that absorbs and emits radiation at all wavelengths. While true black bodies are ideal and do not exist in reality, stars provide the closest real-world approximation.

The spectrum of radiation emitted by a black body is determined solely by its temperature.