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.
A coordinate grid has two perpendicular lines, or axes, labeled like number lines. The horizontal axis is called the x-axis. The vertical axis is called the y-axis. The point where the x-axis and y-axis intersect is called the origin. The numbers on a coordinate grid are used to locate points. Each point can be identified by an ordered pair of numbers; that is, a number on the x-axis called an x-coordinate, and a number on the y-axis called a y-coordinate. Ordered pairs are written in parentheses (x-coordinate, y-coordinate).
1 The x-value tells how the point moves either to the right or left along the x-axis. 2  This axis is the main horizontal line of the rectangular axis or Cartesian plane. 3  The y-value tells how the point moves either up or down along the y-axis. 4  This axis is the main vertical line of the rectangular axis or Cartesian plane. point in a plane contains two components where order matters! It comes in the form (x,y) where x comes first, and y comes second. 1  The x-value tells how the point moves either to the right or left along the x-axis.