DRE/metal energy questions

[Jason]

okay fellas... i have many DRE/metal energy -related questions

1) Exeggutor's Sprit Bomb. (metal)
If I were to attack a benched Salamence with 2 metals, do I place 1 damage counter or three?

2) Kingdra's Dragon Curse (metal)
Same reason as above.

3) Exeggutor's Sprit Bomb (DRE)
Do I do 20 dmg to the two pokemon because of DRE?


Thanks.