what do elements in the same period have the same?
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Explanation:
Elements in the same period have the same number of electron shells; moving across a period (so progressing from group to group), elements gain electrons and protons and become less metallic. This arrangement reflects the periodic recurrence of similar properties as the atomic number increases.
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ᴀ ᴘᴇʀɪᴏᴅ ɪɴ ᴛʜᴇ ᴘᴇʀɪᴏᴅɪᴄ ᴛᴀʙʟᴇ ɪs ᴀ ʀᴏᴡ ᴏғ ᴄʜᴇᴍɪᴄᴀʟ ᴇʟᴇᴍᴇɴᴛs. ᴀʟʟ ᴇʟᴇᴍᴇɴᴛs ɪɴ ᴀ ʀᴏᴡ ʜᴀᴠᴇ ᴛʜᴇ sᴀᴍᴇ ɴᴜᴍʙᴇʀ ᴏғ ᴇʟᴇᴄᴛʀᴏɴ sʜᴇʟʟs. ᴇᴀᴄʜ ɴᴇxᴛ ᴇʟᴇᴍᴇɴᴛ ɪɴ ᴀ ᴘᴇʀɪᴏᴅ ʜᴀs ᴏɴᴇ ᴍᴏʀᴇ ᴘʀᴏᴛᴏɴ ᴀɴᴅ ɪs ʟᴇss ᴍᴇᴛᴀʟʟɪᴄ ᴛʜᴀɴ ɪᴛs ᴘʀᴇᴅᴇᴄᴇssᴏʀ.
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