You would have to research the acient times to find out, or wait for answers...;)
The element xenon got its symbol Xe from its name, which is derived from the Greek word "xenos" meaning stranger. Xenon was considered a rare and unreactive element when it was discovered, hence the name and symbol.
The element plutonium got its symbol "Pu" because it is a radioactive element named after the planet Pluto. Its discovery was highly publicized, leading to the decision to name it after Pluto and assign it the symbol "Pu" based on the first two letters of its name.
If it were Qz, I could understand the question, but the symbol for silicon is Si ... what part of this is confusing?
Polonium got is symbol (Po) from the first two letters of its name. Polonium was named after the nation of Poland by its discoverers Marie and Pierre Curie.
Some of them got their symbol from their Latin name.
The name of the element with symbol 'He' is Helium. It has got 2 Protons and two neutrons in the nucleus and 2 electrons moving around it. It is first in the series of 'Nobel' gases. Others being Neon, Argon, Krypton,Xenon and Radon.
The chemical symbol for arsenic, As, was determined based on its Latin name, "arsenicum." The first letter, A, was chosen to represent the element. This system of using the first letter or first two letters of an element's name to create its chemical symbol was established by chemists in the early days of the periodic table.
Atomic MassAtomic NumberSymbol
Fe is Iron. It isn't 'Ir' because they got Fe from iron's Latin name, ferum. It also can't be 'Ir' because Ir is already the symbol for another element, iridium.
While giving symbols to the elements the first letter of the name of the element was used. But in case of two or more elements with same initial the next elements were given symbols containing first two letters. Since boron has symbol B, so bromine got the symbol Br.
Lithium got its chemical symbol from the first two letters of its name.
It comes from a Germanic word meaning "weight".