Hydrogen cyanide is poisonous liquid that has a faint, almond-like smell. one molecule of hydrogen cyanide (hcn) is made up of one hydrogen atom, one carbon atom, and one nitrogen atom, shown below. which of the answer choices shows the correct lewis dot diagram for hydrogen cyanide?

Many radioactive atoms that have large masses undergo radioactive decay by releasing a particle that is identical to a helium-4 nucleus. what changes in the original atom are expected as a result of this natural phenomenon? the atomic number and the mass number will decrease. the atomic number and the mass number will increase. the atomic number will increase, and the mass number will decrease. the atomic number will decrease, and the mass number will increase.