Why is the atomic mass of technetium usually in brackets?

Answer 1

The brackets are used for isotopic elements--those with variable numbers of neutrons. The atomic weight of the most stable isotope is the one in brackets.

You know, this is a terrible way to be getting your chemistry coursework done.

Here you go:

www.lenntech.com/periodic-chart-elements/tc-en.htm

There you go.

Answer 2

The Atomic Mass of technetium is typically shown in brackets because technetium has no stable isotopes. Instead, it exists only in radioactive isotopes with varying masses, so the bracketed atomic mass represents the weighted average mass of these isotopes.

Answer 3

Because its a synthetic element.

The number that appears in brackets is the most stable isotope of technetium.

Answer 4

Probably because technetium does not occur naturally; all its isotopes are radioactive with short half-lives compared with naturally occurring radioactive elements such as uranium.

Answer 5

The standardized atomic weight of technetium is [98] amu.

Answer 6

Because its a Synthetic Element!!!!!!!!

Answer 7

because you touch yourself at night