ineed the formula, type of bond (ionic or molecular) and polar or non polar of these elements and valence?

Question

elements / valence
Na+1 + I-1 name: sodium iodide
H+1 + H-1 Hydrogen gas
C+4 + O-2 Carbon dioxide

Answer 1

NaI ionic
H2 nonpolar molecular
CO2 polar molecular, but not dipole

Answer 2

Ionic Non-polar Non-polar (while the EN difference is >.5, the dipoles cancel each other out O=C=O ) Atoms are assigned electronegativity values which indicate how much a particular atom "wants" electrons. These classifications vary from book to book, but in general <.5 is covalent, > or equal to .5 is polar, and > or equal to 1.8 is ionic