Question

what does a periodic trend look like on the periodic table?
a. a set of orbitals
b. all elements beginning with same letter of the alphabet
c. a list of properties
d. a repeating pattern

Explanation:

Periodic trends in the periodic table refer to recurring patterns in the properties of elements, such as atomic radius, electronegativity, etc. as you move across rows (periods) or down columns (groups). The word "periodic" implies a repeating nature.

Answer:

D. A repeating pattern