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..
Data modeling in software engineering is the process of creating a data model for an information system by applying formal data modeling techniques.