When nickel combines with fluorine to form nickel (iii) fluoride, the charge of the nickel ion is
a. ni1+.
c. ni3+.
b. ni2+.
d. ni4+.

Energy is released during which phase changes? check all that apply. boiling condensing depositing freezing melting subliming

Select all that apply. a beta particle: is electromagnetic energy is an electron has zero charge is emitted from the nucleus has a +2 charge has a -1 charge

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.