Will all the bulbs have the same brightness in a series circuit no matter how many? does it matter how many bulb there are?

IF all the bulbs are identical bulbs . . . . .

All the bulbs in series have the same brightness, and that brightness
depends on how many there are. More bulbs ... all are equally less bright.
Fewer bulbs ... all are equally brighter.

If the bulbs are not all identical, then it depends on what each one is, which one
was removed, etc., and it can get complicated.

The objects do not reach terminal velocity         there is not enough time from the time the object falls from when it hits the ground to achieve terminal velocity. an object must be placed higher to achieve terminal velocity in order to be in free fall.

Molybdeum(mo)orruthenium (ru)actually, elements with similar chemical properties as technetium would bemn, re, and bh. this is because elements in the same group/family (column) have similar chemical properties. elements in the same period (row) have the same number of energy levels (or shells).