The worst Krakatoa eruption was the 1883 eruption. The eruption began on the 20th May 1883 and finished on the 21st October 1883. I found this out while doing my homework and decided to share the information out for others. Hope this helped!
On the scale that measures the size of explosive eruptions, the 1883 eruption of Krakatoa was a VEI 6. It was about 20 times larger than the 1980 eruption of Mount St. Helens and the second largest eruption in recorded history. The largest was the 1815 eruption of Mount Tambora.
The Krakatoa volcano eruption that occurred in 1883 in Sumatra, Indonesia. It was so powerful that it even destroyed the volcano. Today, Krakatoa's son, "Anak Krakatau" that was made of Krakatoa's eruption stands on the remains of the 1883 Krakatoa eruption.
Not exactly. The explosions generate by the eruption of Krakatoa were enormous, but the island itself was not blown up. The eruption ejected so much magma, that the island of Krakatoa collapsed into the space left behind.