there are____ periods and ____ groups in the modern periodic table.
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A period is a horizontal row of the periodic table. There are seven periods in the periodic table, with each one beginning at the far left
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7 ᴘᴇʀɪᴏᴅs ᴀɴᴅ 18 ɢʀᴏᴜᴘs ......
ʜᴀᴠᴇ ᴀ ɴɪᴄᴇ ᴅᴀʏ◉‿◉
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