20. State modern periodic law
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ᴹᴼᴰᴱᴿᴺ ᴾᴱᴿᴵᴼᴰᴵᶜ ᴸᴬᵂ ᶜᴬᴺ ᴮᴱ ˢᵀᴬᵀᴱᴰ ᴬˢ :
ᴘʀᴏᴘᴇʀᴛɪᴇs ᴏғ ᴇʟᴇᴍᴇɴᴛs ᴀʀᴇ ᴀ ᴘᴇʀɪᴏᴅɪᴄ ғᴜɴᴄᴛɪᴏɴ ᴏғ ᴛʜᴇɪʀ ᴀᴛᴏᴍɪᴄɴᴜᴍʙᴇʀ .ɪᴛ ᴄᴏᴜʟᴅ ʙᴇ ᴍᴀᴅᴇ ᴡɪᴛʜ ᴍᴏʀᴇ ᴘʀᴇᴄɪsɪᴏɴ ᴡʜᴇɴ ᴇʟᴇᴍᴇɴᴛs ᴡᴇʀᴇ ᴀʀʀᴀɴɢᴇᴅ ᴏɴ ᴛʜᴇ ʙᴀsɪs ᴏғ ɪɴᴄʀᴇᴀsɪɴɢ ᴀᴛᴏᴍɪᴄ ɴᴜᴍʙᴇʀ .
ⒽⓄⓅⒺ ⒾⓉ ⒽⒺⓁⓅⓈ
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