Whats the molecular shape for Na2O(sodium oxide) and how to find the bond angles

i know the shapes are on the VSEPR but i don't know how to find out what to pick
and the angles i don't know what to do there
how do i find out the bond angles
please help thank you

looks just like water, H2O, bent molecule, bond angle around 105 degrees
Na has 1 + charge and O has 2 unbonded pairs of electrons. electrical shape is tetrahedral just like water.