Which of the following radioisotopes is naturally occurring?

93^239Np

53^131I

102^254No

96^242Cm

When balanced, which equations would have the coefficient 3 in front of the first set of atoms? Check all that apply.

Which of the following describes the degree to which molecules of one substance are attracted to the molecules of another substance? 1) surface tension 2) cohesion 3) adhesion 4) capillary action

Which situation will most likely cause the sustainability of an ecosystem to weaken? A zebra is killed and eaten by a lion. A disease wipes out several plant species. A frog lays hundreds of eggs that hatch into tadpoles.

What is free-fall acceleration near earth's surface

Which of the following is characterized by existing at a discrete energy level? spin number subatomic particle orbital atomic number

Which of following statements is true about scientific knowledge? Scientific ideas are not subject to change, so scientific knowledge stays the same. Scientific knowledge is constantly evolving as new observations are made.

Why is ice cream a mixture

Which of the following is a type of cell organelle? A. membrane B. cytoplasm C. DNA D. nucleaus

Electromagnetic forces are the predominant force in holding what subatomic particles together?

When in a compound, the oxidation number of a nonmetal: A). is always fixed and can never be changed B). can only be deduced once all the other oxidation numbers in the equation are totaled C).