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CaseSingularPlural
Nominativeименительный · кто? что?период периоды the subject: who or what acts
Accusativeвинительный · кого? что?период периоды the direct object of the verb
Genitiveродительный · кого? чего?периода периодов possession, absence, "of"-phrases
Dativeдательный · кому? чему?периоду периодам the receiver: to or for someone
Instrumentalтворительный · кем? чем?периодом периодами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?периоде периодах location and topics: in, at, about

Период is a masculine noun; the ending pattern above repeats across most masculine nouns, so every table you learn makes the next one cheaper.

Look up any other word in the Russian declension tool, see where период ranks in the most common Russian words, or start from Russian cases explained if the table above is new territory. More vocabulary lives in Russian words by topic and Russian phrases.

12 forms is a table. Using them is a skill.

Slova drills период and every word like it with typed case endings, checked letter by letter.

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