The Three Most Toxic Elements

Arsenic

its symbol is As
its atomic number is 33
its atomic mass is 75
it has 33 protons and electrons
the origin of the name is from the Latin word arsenicum
it was discovered by Albertus Magnus in 1250

Three facts about Arsenic are

Arsenic is naturally present at high levels in the groundwater of several countries.
Arsenic and its compounds are poisonous. They have been used to make rat poison and some insecticides
Small amounts of arsenic are added to germanium to make transistors

Here is a photo of the Arsenic Emission Spectrum

It Is a photo of Arsenic that shows a line of Arsenic Emmision

Public domain

Beryllium

its symbol is Be
its atomic number is 4
its atomic mass is 9
it has 4 protons and electrons
the origin of the name is from Greek glykys for "sweet"
It was discovered by Abbé Haüy in 1798

Three facts about Beryllium are

Beryllium is alloyed with copper (2% beryllium, 98% copper) to form a wear resistant material
Beryllium is relatively transparent to X-rays and is used to make windows for X-ray tubes
Beryllium was once known as glucinum, which means sweet, since beryllium and many of its compounds have a sugary taste

Here is a photo of Beryllium

W. Oelen I did not make changes https://upload.wikimedia.org/wikipedia/commons/f/f6/Beryllium_nuggets_2.jpg

Cadmium

its symbol is Cd
its atomic number is 48
its atomic mass is 112
it has 48 protons and electrons
the name derives from Greek kadmeia for "calamine"
it was discovered by Friedrich Stromeyer in 1817

Three facts about Cadmuim are

Cadmium is a poisonous metal and its use is somewhat limited for this reason.
Beryllium is relatively transparent to X-rays and is used to make windows for X-ray tubes
It is used to make control rods for nuclear reactors

Here is a photo of Cadmuim

public domain

My sources

https://pubchem.ncbi.nlm.nih.gov/element/Arsenic

https://www.osha.gov › toxic-metals

https://umaine.edu/arsenic/what-is-arsenic/#:~:text=Arsenic%20has%20an%20atomic%20number,nucleus%2C%20when%20it%20is%20uncharged.

https://pubchem.ncbi.nlm.nih.gov/element/4#section=History

http://hobart.k12.in.us/ksms/PeriodicTable/beryllium.htm

http://hobart.k12.in.us/ksms/PeriodicTable/cadmium.htm

https://www.who.int/news-room/fact-sheets/detail/arsenic

The Three Most Toxic Elements

its symbol is As

its atomic number is 33

its atomic mass is 75

it has 33 protons and electrons

the origin of the name is from the Latin word arsenicum

it was discovered by Albertus Magnus in 1250

Arsenic is naturally present at high levels in the groundwater of several countries.

Arsenic and its compounds are poisonous. They have been used to make rat poison and some insecticides

Small amounts of arsenic are added to germanium to make transistors

Public domain

its symbol is Be

its atomic number is 4

its atomic mass is 9

it has 4 protons and electrons

the origin of the name is from Greek glykys for "sweet"

It was discovered by Abbé Haüy in 1798

Beryllium is alloyed with copper (2% beryllium, 98% copper) to form a wear resistant material

Beryllium is relatively transparent to X-rays and is used to make windows for X-ray tubes

Beryllium was once known as glucinum, which means sweet, since beryllium and many of its compounds have a sugary taste

W. Oelen I did not make changes https://upload.wikimedia.org/wikipedia/commons/f/f6/Beryllium_nuggets_2.jpg

its symbol is Cd

its atomic number is 48

its atomic mass is 112

it has 48 protons and electrons

the name derives from Greek kadmeia for "calamine"

it was discovered by Friedrich Stromeyer in 1817

Cadmium is a poisonous metal and its use is somewhat limited for this reason.

Beryllium is relatively transparent to X-rays and is used to make windows for X-ray tubes

It is used to make control rods for nuclear reactors

public domain

My sources