-ИЙ-

This suffix is found in words ending in -ия and -ие in the nominative (structurally ий-а and ий-э).

When there isn't a following vowel, as in the genitive plural, then the й appears: compare nom sg расписение with gen pl расписаний.

Stress is on the preceding syllable, unless it also is unstressable.

A few examples from the text:

география Geography

история History

естествознание Natural History

расписание schedule

таблица умножения multiplication table

фамилия surname

занятия studies

пение singing

проиcшествие event

не обращал внимания paid no attention