A period on the periodic table is a horizontal row. The atoms in this row show a trend in their width, and in the amount of work needed to make them an ion, among the fe â¦ w other similarities.
The x-axis and y-axis Remembered! The x-axis and y-axis are two lines that create the coordinate plane. The x-axis is a horizontal line and the y-axis is a vertical line. I'm sure you've heard that a million times, but it might hard for you to remember which one is which. Here is a little trick to help you remember...
In classical Cartesian algebra, the x axis is defined as a horizontal number line defining the distance from a zero point called the origin. The y axis is a vertical line de â¦ fining the vertical distance from the same origin. This system has been adapted to define axes on any number of graphing systems, from Microsoft Excel to modern machine tools.