Why is it das Brennelement?

Brennelement ends in -ment, and nouns ending in -ment are neuter: in a German dictionary, 97% of them take das.

All nouns ending in -ment
Sense 1
das

Meaning

[1] Energy supplier in a nuclear reactor

[1] Energielieferant in einem Kernreaktor

Examples

[1] This fuel element must be processed

[1] Dieses Brennelement muss wiederaufbereitet werden.

Declension

1 Singular Plural
Nominativ das Brennelement die Brennelemente
Genitiv des Brennelementes des Brennelements der Brennelemente
Dativ dem Brennelement dem Brennelemente den Brennelementen
Akkusativ das Brennelement die Brennelemente

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary