_Sb+_O2->_SD3 please it would really help

What are atoms of the same element with varying number of neutrons

Which of the following is a characteristic shared by both electron and light microscopes? a. they both employ the use of objective lenses. b. both microscopes require an internal camera to visualize the specimen. c. both microscopes have a resolving power of 0.01 nm. d. they both utilize white light to magnify the specimen.

Estimate of the number of stars in our galaxy