The atomic number is the number of protons each atom has in its nucleus. By arranging the elements in this way, those with similar properties (characteristics) are grouped together. As with any grid, the periodic table has rows running left to right, and columns running up and down. The rows are called PERIODS and the columns are called GROUPS. Hydrogen (H) is the first element in the periodic table because it has just one proton in its nucleus. Helium (He) is second, because it has two protons, and so on.
The big picture. A software process is a structured set of activities required to develop a software system. Note that we are talking about a software process -- not a software development process..
In software engineering, a software development methodology (also known as a system development methodology, software development life cycle, software development process, software process) is splitting of software development work into distinct phases (or stages) containing activities with the intent of better planning and management.