инертийн хий 2,6
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4. , 5. , 6. . I II III IV V VI VII VIII 1 H He 2 B C N O F Ne 3 Si P S CL Ar 4 As Se Br Kr 5 Te I Xe 6 Rn 7. He Ne Ar Kr Xe 8. 0,0018, 0,0005, 0,0001, 0,000005 . 9. . 10. Ne . 11. . 12. , . 13. 136- . 14. .