On the technetium periodic table why is its relative atomic mass usually in brackets?

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

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

why is the atomic mass of technitium usually in brackets?

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.

because it is an isotope???

All isotopes of technetium are radioactive. Technetium is found only in trace quantities in nature, and then usually only in certain ores where it is a product of radioactive decay. All of the technetium used is synthetic.

Usually only in a laboratory; technetium is an artificial element that does not occur in nature.

a low-level radioactive marker, usually technetium-99m or technetium pertechnetate.

Usually, brackets are used to organize a league's playoff games.

Neither. "Brackets" is used in English, "parentheses" in American.

Brackets are a way of ordering the priority of operations. In mathematics, usually things with brackets have their operations completed first.

The different types of brackets are: round brackets, open brackets or parentheses: ( ) square brackets, closed brackets or box brackets: [ ] curly brackets, squiggly brackets, swirly brackets, braces, or chicken lips: { } angle brackets, diamond brackets, cone brackets or chevrons: < > or ⟨ ⟩ Parentheses (singular, parenthesis)---sometimes called round brackets, curved brackets, oval brackets, or just brackets, or, colloquially, parens --- contain material that could be omitted without destroying or altering…

The technetium heart scan is used to evaluate the heart after a heart attack. It can confirm that a patient had a heart attack when the symptoms and pain usually associated with a heart attack were not present; identify the size and location.

Usually when saying "periodic," scientists usually refer to the periodic table. This table is the shortened version of gasses, solids, liquids, and so on.

brackets are metal hooks that are used to tighten the drum head against the banjo. There are usually about 30 that run around the body of a banjo.

Usually at the top ... and classically written in Roman numerals. Yes, there are numbers at the top of a periodic table, although they are for the groups/families on the periodic table. Usually the period numbers are found to the left of the periodic table.

There are both "square" and "curly" brackets used in algebra. They are [] and {} respectively in type. Usually square brackets are used to group smaller numbers of terms than curly brackets, and even square brackets are used only to group quantities some of which are in parentheses. Thus a suitable use example would be {[(a - b)(c + d) - a2]/[(fg + hj)/[k(l/m)]}. Larger square brackets are also used to set off numbers in…

Brackets are usually attached to the wire by a very short rubber band. Cut the rubber band and save the bracket. So see the Orthodontist to put it back. If you have orthodontic wax, put it on top of any loose brackets about to fall off. This will keep the brackets in place until they can be properly replaced.

The Brackets are usually made of stainless steel or Ni-Ti (Nickel Titanium).

Affordable is a relative term. The local building supply retailer has brackets and shelves that can easily be installed. Some also have unfinished shelving of various sizes. The next step up in affordability would be a discount retail store where there are a range of products, usually in the Home Organization department.

It is called the periodic table of elements. Usually it is just referred to as the periodic table.

they are usually on the left side of the periodic table with the exception of hydrogen

Since it's usually snowing, the relative humidity is near 100%.

Personally, I think no because i think usually we put brackets to simbolise that we are doing more than one equation and has parentheses. :) Play runescape!

it means a music note.. usually used at the beginning or end of a song quote.

Usually over 110 - it varies depending on which periodic table you look at.

Usually they are opposite processes. Factorisation is taking an algebraic expression and partitioning it into factors in brackets (or parentheses). Expansion is taking such brackets and multiplying them out to a simple - if lengthy - expression.

Usually as a range in brackets. The curved brackets, ( and ), are used for "open" intervals, where the end points are not included. The square brackets, [ and ], are used for closed intervals where the end points are included. You can also have semi-closed brackets. For example x is in (3,5) is equivalent to 3 < x < 5 x is in [3,5] is equivalent to 3 ≤ x ≤ 5 x is…

Usually relative density is the density relative to water which has a density of 1000kg/m3 Therefore if you have a relative density of 1.2 the actual density is 1.2 x 1000=1200kg/m3

It depends on which periodic table you're looking at, but usually they signify the metals, non-metals and semi-metals.

A change of frequence in a wave (usually in a sound, or electromagnetic wave), due to the relative movement between the source of the sound and an observer. A change of frequence in a wave (usually in a sound, or electromagnetic wave), due to the relative movement between the source of the sound and an observer. A change of frequence in a wave (usually in a sound, or electromagnetic wave), due to the relative movement…

Usually concentration. pH is said to be -log[H3O+], or the negative log of the hydronium concentration.

Stage directions are usually on a script in brackets or italic next to the person who needs to perform them

Are you talking about a wall sconce? That is a type of candle holder that usually mounts on a wall.

False, a decrease in temperature results in an increase of relative humidity

in math, they act just like parenthesis, to tell you to operate on the terms inside the brackets, first. If you have several levels of nested parenthesis, then using pairs of brackets [] and braces {} help you to see which ones go together. This usually is only used in handwritten problems, as most computer software only recognizes parenthesis () to separate expressions.

All functions have a name and have brackets just after them. So they could be said to be the two main components. For some functions it is mandatory to have something inside the brackets. These are usually known as arguments. For functions that do have them, there are some arguments that are mandatory.

A periodic table is made up of chemical elements. They are all arranged in order of atomic number, usually in rows.

non-metals are usually found on the right hand side of periodic table, the last couple sections.

Elements with similar properties are usually located in the same Group (column) on the Periodic Table.

The number found below the name and symbol of an element on most periodic tables. Usually has a decimal, but doesn't have to.

The periodic table usually displays the symbols and names of the elements, along with information about the structure of their atoms.

Groups are the vertical columns on the periodic table. Elements in the same group usually have similar properties.

The age of a rock or formation given relative to other rocks or formation, usually defined as a zone fossil name

Usually, square brackets, as in "President [Obama] was not amused"

On your braces brackets there is usually a hook (one on top, one on bottom) which you can put your rubber bands on

It usually means fingers crossed on msn so im thinking same on facebook?

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Usually periodic comets have an elliptical orbit.

On the farthest right column of the Periodic Table are the Noble Gasses, which are usually nonreactive.