define atomic size. How does it very in a period and a groups
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ᴀᴛᴏᴍɪᴄ sɪᴢᴇ ɪs ᴛʜᴇ ᴅɪsᴛᴀɴᴄᴇ ʙᴇᴛᴡᴇᴇɴ ᴛʜᴇ ᴄᴇɴᴛᴇʀ ᴏғ ɴᴜᴄʟᴇᴜs ᴀɴᴅ ᴛʜᴇ ᴏᴜᴛᴇʀᴍᴏsᴛ ᴇʟᴇᴄᴛʀᴏɴ ɪɴ ᴛʜᴇ ᴏᴜᴛᴇʀ sʜᴇʟʟ. ᴀᴄʀᴏss ᴀ ᴘᴇʀɪᴏᴅ ғʀᴏᴍ ʟᴇғᴛ ᴛᴏ ʀɪɢʜᴛ ᴛʜᴇʀᴇ ɪs ᴅᴇᴄʀᴇᴀsᴇ ɪɴ ᴀᴛᴏᴍɪᴄ sɪᴢᴇ ᴡɪᴛʜ ɪɴᴄʀᴇᴀsᴇ ɪɴ ɴᴜᴄʟᴇᴀʀ ᴄʜᴀʀɢᴇ ᴏғ ᴛʜᴇ ᴇʟᴇᴍᴇɴᴛ. ᴀᴛᴏᴍɪᴄ sɪᴢᴇ ɪɴᴄʀᴇᴀsᴇs ᴅᴏᴡɴ ᴛʜᴇ ɢʀᴏᴜᴘ ʙᴇᴄᴀᴜsᴇ ᴏғ ᴀᴅᴅɪᴛɪᴏɴ ᴏғ ᴇxᴛʀᴀ sʜᴇʟʟ.❤
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