If the universe were contracting what would happen to the light from the other galaxy as it reached earth

a it would dimmer
b it would be brighter
c it would be blue shift
d it would be red shifted

Which of these conditions most likely produces an unstable isotope?

An atom's configuration based on its number of electrons ends at 3p4. another atom has seven more electrons. starting at 3p, what is the remaining configuration? 3p63d34s2 3p43d54s2 3p64s23d3 3p44s23d

Draw any one of the skeletal structures of a 2° alkyl bromide having the molecular formula of c6h13br and two stereogenic centers. indicate chirality by using wedge and hashed wedge notation. lone pairs do not need to be shown.