What is periodicity? Explain how to change valancy electrons, valancy and no of shells in a group and in a period with examples
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ɪɴ ᴛʜᴇ ᴄᴏɴᴛᴇxᴛ ᴏғ ᴄʜᴇᴍɪsᴛʀʏ ᴀɴᴅ ᴛʜᴇ ᴘᴇʀɪᴏᴅɪᴄ ᴛᴀʙʟᴇ, ᴘᴇʀɪᴏᴅɪᴄɪᴛʏ ʀᴇғᴇʀs ᴛᴏ ᴛʀᴇɴᴅs ᴏʀ ʀᴇᴄᴜʀʀɪɴɢ ᴠᴀʀɪᴀᴛɪᴏɴs ɪɴ ᴇʟᴇᴍᴇɴᴛ ᴘʀᴏᴘᴇʀᴛɪᴇs ᴡɪᴛʜ ɪɴᴄʀᴇᴀsɪɴɢ ᴀᴛᴏᴍɪᴄ ɴᴜᴍʙᴇʀ. ᴘᴇʀɪᴏᴅɪᴄɪᴛʏ ɪs ᴄᴀᴜsᴇᴅ ʙʏ ʀᴇɢᴜʟᴀʀ ᴀɴᴅ ᴘʀᴇᴅɪᴄᴛᴀʙʟᴇ ᴠᴀʀɪᴀᴛɪᴏɴs ɪɴ ᴇʟᴇᴍᴇɴᴛ ᴀᴛᴏᴍɪᴄ sᴛʀᴜᴄᴛᴜʀᴇ.
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