Question

On the modern periodic table, elements are ordered according to what?

Answer 1

Elements on the modern periodic table are ordered by increasing atomic number, which is the number of protons in an atom's nucleus. Similar elements are grouped in vertical columns, with the table organized into periods and groups.

Step-by-step explanation:

On the modern periodic table, elements are ordered according to their atomic number, which is the number of protons in an atom's nucleus. This arrangement is based on the periodic law, which states that the properties of elements are periodic functions of their atomic numbers. Elements with similar properties are grouped together in the same vertical column, known as a group.

The table is organized into seven horizontal rows called periods and 18 vertical columns called groups. Groups have both common names and numbers, ranging from 1 to 18. Some groups, like the alkali metals and noble gases, are known for their distinct chemical properties.

The elements in the periodic table are stacked in such a manner that those with similar chemical properties form vertical columns. The periodic table also includes a separate section for the lanthanides and actinides, which are indicated in group 3 of the table.

Answer 2

The periodic table of elements arranges all of the known chemical elements in an informative array. Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The rows are called periods.