3. X is a particle with 18 electrons and 20 neutrons. Which of the following particles could be X?
1: Ar >
2: 40Ca2+
3: 39K
A. 1, 2 and 3
B. Only 1 and 2
C. Only 2 and 3
D. Only 1

Cobalt-60 is an artificial radioisotope that is produced in a nuclear reactor and is used as a gamma-ray source in the treatment of certain types of cancer. if the wavelength of the gamma radiation from a cobalt-60 source is 1.00 × 10-3 nm, calculate the energy of a photon of this radiation.

What problem would a person have if the nucleic acid in one of his or her cells were damaged?

If i make a solution by adding 83grams of sodium hydroxide to 750ml i’d water what is the molarity of sodium hydroxide