How many quarter notes in a half note?

Here is the correct basic values in Music Theory:

Quarter note = 1 beat = two 8th notes

Whole note = 4 beats = two half notes

Half note = 2 beats = two 8th notes

Half Dotted note = 3 beats = one Half note + one Quarter note

Half Dotted quarter note = (1.5) beat = one Quarter note + one 8th note

8th note = (1/2) beat= two 16th notes

16th note = (1/4) beat = two 32nd notes

32nd note = (1/16) beat = two 64th notes

64th note = (1/32) beat = two 128th notes