Me with this quickly
which statement is completely accurate?

1) atoms atoms of the same element always have different numbers of neutrons
2) atoms of the same element can have different numbers of neutrons
3) atoms of the same element can have neutrons but exist without protons
4) atoms of the same element always have different atomic weights

4( atoms of the same element always have different atomic weights)

Explanation:

the number of protons in the atoms of the same type can be different especially in isotopes

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.