1.Iridium 2.Po 3.40 4.151.964 u + 0.001 u 5.Ithium,sodium,potassium,rubidium,francium,caesium 6.Silicon is a metalloid 7.Group 6 8. I don't know 9. I don't know 10. 108 11.Period 1 12. I don't know 13. 36 protons 14. symbol is Na 15.Ni Please mark me brainliest, this took me so long.Sorry i didn't know 8,9 and 12