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Chemistry
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Why do melting points decrease down the group 1 and increade down the group 7? (core syllabus: Periodicity)

Elements in the group one (i.e. alkali metals from lithium to francium) exhibit metallic bonding: the positive nuclei are held together thanks to the attraction to delocalised electrons. As the number ...

PM
Answered by Paulina M. Chemistry tutor
86716 Views

What is a ligand?

A species with one or more valence electron pairs that forms co-ordinate bonds with a metal ion. 

UY
Answered by Umamah Y. Chemistry tutor
4473 Views

Hydrogen bromide forms a strong acid when dissolved in water whereas hydrogen fluoride forms a weak acid. Distinguish between the terms strong acid and weak acid. State equations to describe the dissociation of each acid in aqueous solution. [3]

Here, we have to focus on the term strong acid. It is defined as an acid that is dissolved completely in an aqueous solution. We say that the reaction of dissociation of the acid goes ...

JO
Answered by Juraj O. Chemistry tutor
41517 Views

What is the relative formula mass of sodium chloride?

58.5

Relative formula mass (Mr) is found by adding together the relative atomic masses (Ar) of all the atoms present in a compound. 

S...

JS
Answered by Jenny S. Chemistry tutor
62271 Views

Providing reasoning, what is the trend in the atomic radius of row 3 elements across the periodic table?

Decreasing atomic radius across the periodic table.

- greater number of protons in the nucleus resulting in a greater nuclear charge.

- little/no change in ...

JS
Answered by Jenny S. Chemistry tutor
4504 Views

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