How do models scientists predict the polarity of a molecule?

The polarity of a molecule tells whether the electron cloud is equally distributed across the atoms within the molecule, or whether an electronegative atom is affecting the electron density. The distribution of the electrons will affect the behavior and reactivity of the molecule. For example, you can predict which solvents will be most effective with a given chemical if you know its polarity.

Explanation:

Water and oil do not mix well, despite the fact that they are both homogenous solutions on their own. This behavior can be explained through a deeper look at the polar forces affecting the two solutions.

its first and third is your answer i did the qustion the fourth isnt right

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally