How does the periodic table us to predict unknown elements?

The periodic table is a systematic arrangement of the elements. They are arranged according to their atomic number, the number of protons (which in the case of atoms is also the number of electrons) of each atom.

If you compare the unknown element to the various groups and periods on the table, it is easy to find which group the unknown most closely resembles in chemical and physical properties.

Please brainliest me if this helped; trying to level up!

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.

its first and third is your answer i did the qustion the fourth isnt right