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From Chemguide:

Chlorine to iodine

Considering the halogens from chlorine to iodine, it is the lattice enthalpy which has fallen most. It falls by 87 kJ mol-1. By contrast, the heat needed to remove the electron has only fallen by 54 kJ mol-1.

Shouldn't it be "has fallen the most"?

There are several characteristics, and one has fallen by the highest amount compared with the others.

CowperKettle
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1 Answers1

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You can use either of the following:

it is the lattice enthalpy which has fallen most

or

it is lattice enthalpy which has fallen the most

A repetitive use of "the" makes it somewhat unnatural, although not grammatically incorrect.

Aldo
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