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True or False does our body contains a number of radioactive isotopes?
Wiki User
∙ 14y ago
yes, off the top of my head i can think of carbon 14, which is radioactive and has a half life of 5370 years.
Wiki User
∙ 14y ago
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Can the half life of a radioactive isotope decrease as the isotope decays?
No, the half-life of a radioactive isotope does not decrease as the isotope decays. That half-life remains constant. It's the amount of the substance that decreases as the isotope decays.
True or False Fossils may be dated by either the relative dating method which determines the relative order of fossils or by the absolute dating method which uses radioactive isotopes?
True
Should Radioactive isotopes used for medical purpose have long lives?
Radioactive isotopes used for medical purpose should not have long lives. The imaging cameras need to pick up the particles from the decay of the radioactive nuclei, and having a lot within an hour or two means a short half-life.
True or false two isotopes of carbon are carbon-12 and carbon-14 theese isotopes differ from one another by two ELECTRONS?
False, different isotopes of the same element have different numbers of neutrons.
Do Isotopes differ from each other only in the number of electrons contained?
Isotopes differ in the number of neutrons. All atoms are neutral - they always contain the same number of protons (positive) as electrons (negative). If they lose or gain electrons, they become ions. If they lose or gain protons (as in radioactive decay), they become a different element. An element is defined by its atomic number, which is the number of protons. Atoms may differ in their atomic mass. The difference is due to differing numbers of neutrons. The atomic mass on the periodic chart is the proportional average of all the naturally occurring isotopes. To determine how many neutrons in an atom, subtract the atomic number from the atomic mass.
All living things on earth are radioactive true or false?
False. All matter, including living matter, contains traces of radioactive isotopes.
Are radioactive isotopes are used in medicines or power plants and tracers true of false?
true
The atomic number of isotopes is determined by the number of atoms. true or false?
False. Number of neutrons.
True or false unstable atom that decomposes and emits energy is called retroactive?
No, it's called "radioactive." "Retroactive" is something that's active in regards to the past.
Is it true or false that isotopes are forms of an element that have the same number of protons but a different number of electrons?
false they have the same number of protons, but varying numbers of neutrons
Can the half life of a radioactive isotope decrease as the isotope decays?
No, the half-life of a radioactive isotope does not decrease as the isotope decays. That half-life remains constant. It's the amount of the substance that decreases as the isotope decays.
True or False Fossils may be dated by either the relative dating method which determines the relative order of fossils or by the absolute dating method which uses radioactive isotopes?
True
The number of neutrons is equal to the atomic number true or false?
False as a generalization but true for some isotopes. The atomic number is the number of protons in a nucleus, which may coincidentally be the same as the number of neutrons but is not required to be.
If a number contains decimal places is it always an irrational number?
No, that is false.
Should Radioactive isotopes used for medical purpose have long lives?
Radioactive isotopes used for medical purpose should not have long lives. The imaging cameras need to pick up the particles from the decay of the radioactive nuclei, and having a lot within an hour or two means a short half-life.
The number of atoms in a mole of an element depends on what the element is. true or false?
That would be FALSE. One mole of every atom contains the same number of atoms, and that number is 6.02x10^23 atoms.
True or false two isotopes of carbon are carbon-12 and carbon-14 theese isotopes differ from one another by two ELECTRONS?
False, different isotopes of the same element have different numbers of neutrons.
