what was the basis of arranging the elements in it.
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ᴇʟᴇᴍᴇɴᴛꜱ ᴀʀᴇ ᴀʀʀᴀɴɢᴇᴅ ᴏɴ ᴛʜᴇ ʙᴀꜱɪꜱ ᴏꜰ ɪɴᴄʀᴇᴀꜱɪɴɢ ᴏʀᴅᴇʀ ᴏꜰ ᴀᴛᴏᴍɪᴄ ɴᴜᴍʙᴇʀꜱ. ᴛʜᴇ ʜᴏʀɪᴢᴏɴᴛᴀʟ ʀᴏᴡꜱ ɪɴ ᴛʜᴇ ᴩᴇʀɪᴏᴅɪᴄ ᴛᴀʙʟᴇ ᴀʀᴇ ᴄᴀʟʟᴇᴅ ᴩᴇʀɪᴏᴅꜱ ᴀɴᴅ ᴛʜᴇ ᴠᴇʀᴛɪᴄᴀʟ ᴄᴏʟᴜᴍɴꜱ ᴀʀᴇ ᴋɴᴏᴡɴ ᴀꜱ ᴛʜᴇ ɢʀᴏᴜᴩꜱ. ᴛʜᴇ ᴇʟᴇᴍᴇɴᴛꜱ ɪɴ ᴛʜᴇ ᴍᴏᴅᴇʀɴ ᴩᴇʀɪᴏᴅɪᴄ ᴛᴀʙʟᴇ ᴀʀᴇ ᴀʀʀᴀɴɢᴇᴅ ɪɴ 7 ᴩᴇʀɪᴏᴅꜱ ᴀɴᴅ 18 ɢʀᴏᴜᴩꜱ.
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