because ium is a scientific word for element
It is a Latin word suffix for nouns identifying their syntactic place in a sentence. Another Latin word suffix is us. One means subject and the other means object of sentence, but I can't remember which is which right now.
Because -ium is a Latin termination and this is an old tradition of the nomenclature.
It is just plain old luck
Latin word suffix.
75
75 elements
Elements ending in -ium are metals. Sodium and Calcium are alkali metals.
If you aren't counting the ones that end in -ium, as they technically also end in -um, you are left with Molybdenum, Tantalum, Lanthanum and Platinum. Depending on where you live, you will also have Aluminum, although in many countries it is known as Aluminium
Most metals are denoted in the Periodic Table by the suffix -ium. Some metals are Cadmium, Sodium and Iron.
The elements with the electron configurations that end in ns 2 and np 5 are halogens, group VII A elements.
75 elements
ium
Most are solid and weakly paramagnetic metals. Exception of Helium, etc.
Calcium, Potassium, and Helium
39 from main table + all 14 lanthanides +all 14 actinides (but looking for elements<101 so, only 11) Hence, 64/100 elements with names ending in -ium.
Because they do.
Elements ending in -ium are metals. Sodium and Calcium are alkali metals.
There are many suffixes used with naming compounds. The suffixes most commonly used are -ous, -ide,-ite, -ic, or -ate.
Binary compounds generally end i with the suffix -ide.
Maracana
Check out the perodic table of elements if you haven't already. There are quite a few words ending in -ium. Aside from that, opium is valid.
If you aren't counting the ones that end in -ium, as they technically also end in -um, you are left with Molybdenum, Tantalum, Lanthanum and Platinum. Depending on where you live, you will also have Aluminum, although in many countries it is known as Aluminium