Question

The periodic table organizes elements by

A increasing atomic mass
B increasing atomic number
C decreasing atomic size
D different atomic color

Answer 1

Answer: B increasing atomic number

Explanation: A periodic table is the table that shows the arrangement of elements in the order of increasing atomic number. In the periodic table, the horizontal rows of elements are called periods while the vertical columns are called groups. All the elements in a given period have the same number of electron shell while all the elements in the same group have the same number of valence electrons (same number of electrons in the outermost shell of their atoms).