Which step follows the identification of the problem in the technological design process?

With i really need the correct answer!

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

The california mussel (mytilus californianus) attaches itself to a rock or other solid surface with a bundle of filaments known as the byssus. imagine that 15.0 j of work is done to stretch the distal end of the byssus. it releases 10.8 j of thermal energy as it relaxes. what is the resilience of the distal end of the byssus?