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...
x-axis-The horizontal axis of a graph, with which the x-values are plotted. x-coordinate-The number which corresponds to the value of x in an ordered pair. x-intercept-The point at which the graph of a line crosses the x-axis. The point at which y = 0. xy-graph-A two-dimensional way of representing points.