What is an arpeggio? A.
a blend of several tones, which reverberate simultaneously
B.
playing a series of chords in a particular order
C.
unsteady combination of chords producing rough sound
D.
musical notes set to sound in a discontinuous manner

B because an arpeggio is when notes of a chord played in succession, and are either ascending or descending.

it's c. elements are placed in rows based on how may valencies electrons have.

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.