Question

which phrase best describes a period on the periodic table? (1 point)
o elements that have the same number of electrons
o elements that are in the same group
o a row of elements
o a column of elements

Explanation:

In the periodic table, a period is defined as a row of elements. Elements in the same period have the same number of electron - shells. Elements with the same number of electrons would be ions or atoms of the same element in different states. Elements in the same group have the same number of valence electrons and are in columns.

Answer:

C. a row of elements