A horizontal row is called a period. Atomic numbers increase from left to right and from top to bottom in the table. The periodic table is arranged in order of increasing number protons periodic table all the elements are placed in order of increasing atomic sment questions in the modern periodic table elements are arranged order of increasing atomic the modern periodic table. The most noticeable feature of the periodic table is that it is arranged as a chart with seven rows and eight columns, although the number of columns increases toward the bottom of the chart. The figure below shows the most commonly used form of the periodic table. All periods begin with an alkali metal in group 1 and end with a noble gas in group 18/8A. British scientist Henry Mosely determined the atomic â¦ In the modern periodic table, each element is represented by its chemical symbol. Chemists refer to each row as a period and each column as a group. In this form of a periodic table, the horizontal rows are called periods and the vertical columns are known as the groups. In the modern periodic table, the electronegativity of elements increases across a period (row) and decreases down a group (column). Elements are arranged in the table by increasing atomic number. The periodic table is an arrangement of the elements in order of their atomic numbers so that elements with similar properties appear in the same vertical column or group. The modern periodic table consists of 7 periods ( horizontal rows ) , 18 groups ( vertical columns ) , The elements are arranged ascendingly according to their atomic numbers and the way to fill their atomic energy sublevels by electrons according to the Aufbeau ( building-up ) principle , where each element has one electron more than the element preceds it . Each element has its own unique atomic number, which is the number of protons in the nuclei of its atoms, and which defines the element. The arrangement of the periodic table was formulated in order to give a very informative representation of the chemical elements. The number above each symbol is its atomic number. Each of these elements is specifically placed in the periodic table, keeping specific parameters in mind. The modern periodic table is arranged by increasing atomic number (option a): it starts with the hydrogen atom and increases 1 proton each time to the right. Therefore, the bottom-left most element (francium) is predicted to have the lowest electronegativity and the top-right most element (fluorine) is â¦ The arrangement of the periodic table has changed over time since its inception. The elements are arranged into 18 groups (columns) and seven periods (rows) by increasing atomic number. Periodic table is the amazing and magical rearrangement of elements. Each square shows the â¦ The modern periodic table is used to organize all the known elements. 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