What is similar between elements in horizontal rows in the periodic table?

A horizontal row on the Periodic Table is called a Period; and in the same Period, electrons fill the SAME valence shell. ... Full valence shells, i.e. the element has 2 OR 10 electrons, are stable electronic structure

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these macromolecules could either be amino acids, proteins or nucleic acids. they are responsible for the chemical changes and reactions that affects largely the cell and its composition. take for instance the cytoplasm of the cell where these organelles are settled. these simple organelles are composed of macromolecules which ignites and catalyses different functions that enables cells, in macro-perspective in motion and metabolism. in intestines for example, metabolism happens and breaking down parts of a food to simpler compounds that are used and these nutrients delivered throughout the body and again broken down by into smaller components.