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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.
Wiki User
∙ 15y ago
Wiki User
∙ 13y agoBecause its a synthetic element.
The number that appears in brackets is the most stable isotope of technetium.
Wiki User
∙ 14y agoProbably because technetium does not occur naturally; all its isotopes are radioactive with short half-lives compared with naturally occurring radioactive elements such as uranium.
Wiki User
∙ 8y agoThe standardized atomic weight of technetium is [98] amu.
Wiki User
∙ 15y agoBecause its a Synthetic Element!!!!!!!!
Wiki User
∙ 12y agobecause you touch yourself at night
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What is the atomic mass of technetium?
I assume you mean the atomic mass. Its atomic mass is 98.91g/mol
Why is technetiums relative mass usually found in brackets on the period table?
why is the atomic mass of technitium usually in brackets?
Technetium in brackets?
Any time you see the atomic mass of an element in brackets on the periodic chart, that number represents the mass number of the longest-lived or best-known isotope of that element. In other words there is no stable isotope, i.e. all forms of it are radioactive.
What is an element with an atomic mass of 47.9?
Titanium(Ti)
Why is technetiums relative atomic mass usually found in brackets on the period table?
because it is an isotope???
What is the atomic mass of technetium?
I assume you mean the atomic mass. Its atomic mass is 98.91g/mol
Why is technetiums relative mass usually found in brackets on the period table?
why is the atomic mass of technitium usually in brackets?
Technetium in brackets?
Any time you see the atomic mass of an element in brackets on the periodic chart, that number represents the mass number of the longest-lived or best-known isotope of that element. In other words there is no stable isotope, i.e. all forms of it are radioactive.
What is an element with an atomic mass of 47.9?
Titanium(Ti)
Why is technetiums relative atomic mass usually found in brackets on the period table?
because it is an isotope???
What is the lightest men made element?
Technetium which has an atomic mass of 98.
What is the molecular weight of technetium 99?
The atomic mass (not molecular weight) of technetium-99 is 98,906 254 7(21).
What is the atomic weight of technetium?
The atomic number of technetium (Tc) is 43.The atomic weight of Tc is 98 grams per mole.See the Web Links to the left of this answer for a periodic table with more information about this element!
What is the nucleus for technetium?
The atomic nucleus of technetium contain 43 protons and electrons.For each isotope the number of neutrons is different. Number of neutrons = Mass number of an Tc isotope - 43
The mass of an atom usually expressed in atomic mass units is its?
Atomic mass
What has the lowest atomic number of any metal?
Bromine, because Bromine has an atomic mass of only 5.
How many neutrons does technetium have?
Technetium has 34 isotopes, with no stable isotopes
