10.

The seventh plague of Egypt: Hail shall come down upon them and they shall die.

After God turned the rivers into blood in the first plague, he continued with these five:

Frogs. (8:1-7)

Lice. (8:16-19)

Flies (8:21-24)

All cattle in Egypt die. (9:3-6)

Festering boils on man and beast. (9:9-10)

The Bible doesn't say whether anyone died from these plagues. Frogs, lice, flies, dead animals as far as you can see, and boils covering every person and animal in Egypt. These things were no doubt unpleasant. But did it kill anyone? There's just no way of knowing.

But the Bible is clear about the seventh plague: hail.

Upon every man and beast which shall be found in the field ... the hail shall come down upon them, and they shall die. ... So there was hail, and fire mingled with the hail, very grievous ... And the hail smote throughout all the land of Egypt all that was in the field, both man and beast. Exodus 9:19-25

So God killed everybody in Egypt who was out and about that day with fire and hail (except Israelites).

Only in the land of Goshen, where the children of Israel were, was there no hail. 9:26

But how many people would that have been?

Well, the Egyptian population is estimated to have been 3 million at the time the Exodus supposedly happened [1]. So if maybe 10% of the Egyptians were in the field at the time, about 300,000 would have been killed by God's fiery hail storm.

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Notes

1. Colin McEvedy and Richard M. Jones, Atlas of World Population History (Middlesex, England: Penguin, 1978), p.226