Isotopes

The atomic number of the isotopes of an element is identical; the mass number is different.

n

The number of neutrons is different for each isotope.

One with a half-life close to the age of the object

ho

Tis is the isotope astatin-18.

You forgot to say that isotope is.

The correct symbol is 2914Si.

13

Carbon decay or carbon dating

A "superscript" number before the symbol for the element - eg.

11C

12C

13C

14C

Denotes the four isotopes of the element Carbon.

The superscript number is a count of the total number of "nucleons" (protons and neutrons) in the atomic nucleus of the atom.

If you subtract the elements "atomic number" (which is the number of Protons that element has) from the Isotope (superscript) number you get the number of Neutrons in that isotope.

From this you will be able to deduce that isotopes of elements are caused by a variation in the number of neutrons in an atom of an element.

heavier isotopes can be produces but their halflives are in the microsecond or shorter range.

yes, it is correct.

"Daughter isotopes" are called the decay products of an radioactive isotope.

Yes

The principle behind the use of radioactive tracers is that an atom in a chemical compound is replaced by another atom, of the same chemical element. The substituting atom, however, is a radioactive isotope. This process is often called radioactive labeling.

An isotope of an element has a different number of Neutrons to the original element it came from.

EG: Carbon( 11 neurtons) can go to carbon(12 Neutrons(

No, thallium isotopes do not contain iodine. Thallium isotopes are variants of the element thallium, while iodine is a separate element with its own isotopes.

5123V or V-51

Because the isotopes do not appear in equal amounts.

This is hardly surprising since many isotopes experience radioactive decay and change to other elements after decay while stable isotopes persist - thus stable isotopes will usually dominate as the most common isotopes for individual elements with those with the longest half-lifes being more common than those with shorter half-lifes. Of course when you get into the heaviest elements there don't seem to be any stable isotopes so those with longest half life dominate.

Yes. There are isotopes of elements that are simply not found anywhere in the universe (and even if they did exist momentarily, their lifetime is so short that in the next moment they would have decayed into a different more stable isotope).

Some applications of americium are:

- smoke detectors

- source of neutrons, alpha particles, gamma rays

- nuclear densimeters

- calibration of gamma rays spectrometers

- initial reactant for nuclear reactions to obtain heavier isotopes

For score-keeping purposes, every defensive position is assigned a number. This number has nothing to do with the number on the back of a player's uniform. The scoring numbers are: 1 -- pitcher 2 -- catcher 3 -- first base 4 -- second base 5 -- third base 6 -- shortstop 7 -- left field 8 -- center field 9 -- right field so a scoredcard reading, for example, "E-6", would mean an error on the shortstop.

It sounds like they are elements on the periodic table of elements.