an element has atomic number 18
to which period and group of the periodic table does it belongs
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ᴘᴇʀɪᴏᴅ 1 ʜᴀꜱ ᴏɴʟʏ ᴛᴡᴏ ᴇʟᴇᴍᴇɴᴛꜱ (ʜʏᴅʀᴏɢᴇɴ ᴀɴᴅ ʜᴇʟɪᴜᴍ), ᴡʜɪʟᴇ ᴘᴇʀɪᴏᴅꜱ 2 ᴀɴᴅ 3 ʜᴀᴠᴇ 8 ᴇʟᴇᴍᴇɴᴛꜱ. ᴘᴇʀɪᴏᴅꜱ 4 ᴀɴᴅ 5 ʜᴀᴠᴇ 18 ᴇʟᴇᴍᴇɴᴛꜱ. ᴘᴇʀɪᴏᴅꜱ 6 ᴀɴᴅ 7 ʜᴀᴠᴇ 32 ᴇʟᴇᴍᴇɴᴛꜱ ʙᴇᴄᴀᴜꜱᴇ ᴛʜᴇ ᴛᴡᴏ ʙᴏᴛᴛᴏᴍ ʀᴏᴡꜱ ᴛʜᴀᴛ ᴀʀᴇ ꜱᴇᴘᴀʀᴀᴛᴇᴅ ꜰʀᴏᴍ ᴛʜᴇ ʀᴇꜱᴛ ᴏꜰ ᴛʜᴇ ᴛᴀʙʟᴇ ʙᴇʟᴏɴɢ ᴛᴏ ᴛʜᴏꜱᴇ ᴘᴇʀɪᴏᴅꜱ.
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Period 1 has only two elements (hydrogen and helium), while periods 2 and 3 have 8 elements. Periods 4 and 5 have 18 elements. Periods 6 and 7 have 32 elements because the two bottom rows that are separated from the rest of the table belong to those periods.
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