Is there a web site that shows the original Table and changes made (elements), in date sequence?

I've seen several versions of the roman numeral Group names. For example, some refer to (new) Group 18 as Group O, others call it VIIIB. Who decides these names, and why the confusion?

I notice Tables on the internet do not include these roman numeral Group names at all. Have they been rendered entirely obsolete?

Thanks,
George

Am looking for a periodic table that contains both the atomic and the mass number! Someone help pls! :-)

. . .do. Why are they called Diatomic elements? Is their an easy way to remeber them? Just found this site seems pretty cool.

Robert

I'm confused

:?:

How can those stars create natural elements that are heavier
than Fe?

You may know that the fusion of nuclears must be
ended at Fe.

does anyone know how the elements of the periodic table got their name or at least a good website that i can find the information????? :D

hi all.i'm new to the study of coordination compounds...as part of the basics,i have to start with the namings ....so...does anyone know any hints as to how i can learn to name the complex compounds when given its chemical formula....in other words...im asking.."is there any easier way to learning this?...VINAKA

Indium sulfate is being marketed as the newest miracle dietary supplement. On the Web Elements Indium page, under biological information, the statement is made that "Indium has no biological role. In small doses it is said to stimulate the metabolism." but under hazards and risks, the statement "All indium compounds should be regarded as highly toxic. Indium compounds damage the heart, kidney and liver, and may be teratogenic." The second statement is consistent with the research I have done in the past few days. The first statement is consistent only with the highly suspect claims of the marketers. I strongly recommend that the statement that "it is said to stimulate the metabolism" be deleted from this page, as the only stimulation I have been able to find is that it makes membranes rigid by peroxidating them, and stimulates the cellular uptake of chromium, zinc, manganese and copper. Thank you.

a.to what kind of chemical reaction does ir belonge?
b.describe the change in the character of these reaction can be used to compare the reactivity of sodium with does of lithium an potassium

for each of the following properties, state how you would expect it to change in the direction indicated and give a reason for the change.
a.the electronegative down the group
b.the atomic radius giong across the group
c.the radius of an anion compared to its parent atom
d. the first ionisation energy going down the group
c. the radius of a series of isoelectronic species with increasing atomic number