What kind of atoms typically have unstable nuclei?

a. atoms with a neutron count less than 90
b. atoms with a neutron count greater than 90
c. atoms with a proton count less than 90
d. atoms with a proton count greater than 90

oxygen +1 most likely

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."

the growth of the plants is affected by the heat of the light. what is the student doing?