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Isotopes
Isotopes are atoms that have different number of neutrons, so they have a different mass number than the other atoms in an element.
1,075 Questions
Cosmogenic isotopes are isotopes that are produced in rocks or minerals by the interaction of cosmic radiation with the Earth's surface. They are useful for dating geological events, such as erosion and exposure ages of rocks, and for studying processes such as rock weathering and sediment transport. Examples include beryllium-10 and aluminum-26.
18 grams are one fourth of the original sample mass of 72 grams. Accordingly, the half life is 6.2/4 = 1.55 days.
What do radioactive isotopes have?
- The isotopes of any element will have the same number of valence electrons or valency, resulting in identical chemical properties.
- The isotopes' physical properties are different mainly due to the neutron number variation, present in the nucleus. Properties such as melting point, boiling point, density etc., which depend upon the atomic mass should be different for different isotopes because the isotopes of an element have different masses.
Why do elements which exists as isotopes have fractional atomic mass?
Each isotope of an element has a different Atomic Mass, so an average is taken of all the isotopes, but the average is weighted because the natural abundance (%) of each isotope is factored in. If hydrogen-1 is much more abundant than deuterium and tritium, then the weighted average will be closer to 1 than 2 or 3 but not a whole number.
The following equation shows how percent abundance factors into the weighted average.
(atomic mass A)(X% abundance) + (atomic mass B)(Y% abundance)...=(weighted average of all isotopes of the element)(100% abundance)
Electrolytes are substances able to be dissociated in solution or after melting.
Isotopes are atoms of chemical elements; isotopes have different number of neutrons.
How are two isotopes of an element similar to each other?
The numbers of protons and electrons are identical.
How do biological processes fractionate light and heavy isotopes of the same element?
This phenomenon is probable possible for hydrogen, boron, nitrogen, carbon, oxygen and lithium isotopes. Repeated cycles of chemical reactions can lead to some fractionation by ion exchange or other processes.
Are there common isotopes for krypton and what are their uses?
Isotopes of krypton are: Kr-78, Kr-80 to Kr-84, Kr-86. Kr-83 was used in magnetic resonance imaging.
Probable you think to scintimetry.
What is the unchanged element of isotopes?
"element" is a very confusing word for what you are asking. But what I think you are asking is what part of an atom does not change with an isotope. I'll answer that question.
An isotope of an atom is a variation fo the element in which the atom has a different number of neutrons. However, the number of protons can never change in a single element. So no matter how many atoms of a certain element are gathered, no matter how many different isotopes there are, they all have the exact same number of protons.
How do radioisotopes of an element differ feom other isotopes?
Radioisotopes are "radioactive isotopes"; they are not stable. Radioactive atoms will decay, or break apart into other atoms, by emitting an electron, or a neutron or a positron or an alpha particle (2 protons and two neutrons). The rate at which this happens is measured by the "half-life"; after one half-life, half of the atoms will have decayed. After another half-life, half of the remaining atoms will have decayed.
Atoms with short half-lives are highly radioactive, and can be fairly dangerous. Atoms with long half-lives are only slightly radioactive, and aren't all that dangerous.
How many electrons are in the isotope Ca-42?
If 42 is the atomic number then there is 42 electrons in isotope.
Which notation is used to represent gamma decay?
The symbol of gamma rays is γ.
Between the initial atom and the daughter atom from decay an arrow (→) is placed.
Can an atom of oxygen be an isotope of an atom of nitrogen?
No. Nitrogen and oxygen are two different elements. The identity of an element is determined by the number of protons in the nucleus. A nitrogen atom has 7 protons while an oxygen atom has 8. Isotopes are variations of the atoms of a given element that differ in the number of neutrons in the nucleus.
What is the atomic mass number of the most common isotope for mercury?
Mercury is a metal element. Mass number of it is 201.
Two new isotopes are produced by fission.
What type of radiation is emitted by thorium?
Thorium-232 is an alpha emitter; rarely decay by spontaneous fission or double beta decay are possible.
How many neutron are in curium?
Number of neutrons = atomic mass of an isotope - atomic number of the isotope The atomic number of curium is 96; for the isotopic masses read at: http://en.wikipedia.org/wiki/Isotopes_of_curium.
How many protons neutrons and electrons have K-41?
Potassium-41 has 19 electrons and protons and 22 neutrons.
