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i need these 4 questions for 4 elements: H2O, NH3, CH4, and CO2

so which element has covalent bonds?

i think all of them

The ones with covalent bonds are the ones that share their electrons

so all of them?

i already have all the lewis structures in front of me

Yes all are covalent bonds of some sort

ok, and im really having trouble with the electronegativity, how do i calculate that

so subtract the atomic number from atomic mass?

and then subtract the electronegativity from the atomic number?

No you subtract the electronegativities between the two elements

im lost.. could you do an example? what two elements are you talking abuit

HF
H has an electronegativity of 2.20
F has an electronegativity of 3.98
3.98-2.20=1.78

ohhh so you always subtract the lesser from the larger? or can you get a negative

I don't think there should be a negative i'm pretty sure it is always larger minus smaller

ok give me a sec to do all 4

H2O: Polar
CO2: Nonpolar
CH4: Nonpolar
NH3: Polar
im pretty sure im correct

they're all covalent

|dw:1440641172502:dw|

EN of H2O is 1.24?

EN is for a element.

oh, i meant 1.24 is what i got after i subtactred them

i see

Yes you were correct about which ones are polar and non polar ones

ok, and i was correct about them all being covalent right

Yes they are only polar and non-polar if they are also covalent

and i did the calculations and this is what i got
H2O: 1.24
CO2: 0.89
CH4: 0.35
NH3: 0.84