Now, onto the mystery as posed to us by the devious mind of
@Victoria Silverwolf,
Death on Venus: A Solve-It-Yourself Mystery
A most ingenious puzzle, and one which had my little grey cells working overtime. However, I think I solved it...
The elements with the atomic numbers 15, 16, 18 and 53
are Phosphorus, Sulphur, Argon and Iodine
en.wikipedia.org/wiki/Periodic_table
Their atomic symbols put together spell PSArI
Psari is Greek for fish
en.wikipedia.org/wiki/Psari
Another Greek word for fish is ikhthýs
en.wiktionary.org/wiki/ἰχθύς
Ichthys is a symbol of Christianity, also known as Jesus fish
en.wikipedia.org/wiki/Ichthys
Jesus was born in Nazareth
en.wikipedia.org/wiki/Jesus
Nazareth was the name of a rock band in the 1970s
en.wikipedia.org/wiki/Nazareth_(band)
Nazareth's lead singer was Dan McCafferty
en.wikipedia.org/wiki/Dan_McCafferty
McCafferty is a traditional song particularly popular in Ireland
en.wikipedia.org/wiki/McCafferty
McCafferty was recorded by The Dubliners, who perform traditional Irish music
en.wikipedia.org/wiki/The_Dubliners
The Making of Irish Traditional Music is a book written by Helen O'Shea
goodreads.com/book/show/6135523-the-making-of-irish-traditional-music
Helen is the name of the most beautiful woman in the world
en.wikipedia.org/wiki/Helen_of_Troy
Helen of Troy eloped with the Greek hero Paris
en.wikipedia.org/wiki/Paris_(mythology)
Paris is the name of a city in France.
en.wikipedia.org/wiki/Paris
Therefore, the city to be attacked must be Paris.
Easy!
PS I spent more time on this than I did writing my entry