What happens to a radioisotope when it undergoes nuclear decay?
a) it emits charged particles but no energy.
b) it remains stable.
c) it becomes a different element.
d) it emits neutral particles and no energy.

Ithink is a because if say increased in electronegativity

The population of unionid mussels decreased after zebra mussels were introduced. zebra mussels competed with the unionid mussels for food. the zebra mussels were able to displace the unionid mussels, allowing the zebra mussel population to increase  over the years. the unionid mussel population decreased because  of lack of food.

Heat of fusion= heat/mass  heat of fusion = 12.03kj/36 g= 0.3342 kj/g or 334.2 j/g

The answer is b electromagnetic i believe, i hope i ya out!