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It accounts for, I'm just rounding off, Now, some of the other isotopes of potassium.
You also have potassium-- and once again writing the K and the 19 are a little bit redundant-- you also have potassium So this would have 22 neutrons. This accounts for about 6. And then you have a very scarce isotope of potassium called potassium Potassium clearly has 21 neutrons.
And it's very, very, very, very scarce. It accounts for only 0. But this is also the isotope of potassium that's interesting to us from the point of view of dating old, old rock, and especially old volcanic rock. And as we'll see, when you can date old volcanic rock it allows you to date other types of rock or other types of fossils that might be sandwiched in between old volcanic rock.
And so what's really interesting about potassium here is that it has a half-life of 1. So the good thing about that, as opposed to something like carbon, it can be used to date really, really, really old things.
And every 1.
So argon is right over here. It has 18 protons. So when you think about it decaying into argon, what you see is that it lost a proton, but it has the same mass number. So one of the protons must of somehow turned into a neutron. And it actually captures one of the inner electrons, and then it emits other things, and I won't go into all the quantum physics of it, but it turns into argon And you see calcium on the periodic table right over here has 20 protons.
So this is a situation where one of the neutrons turns into a proton.
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This is a situation where one of the protons turns into a neutron. And what's really interesting to us is this part right over here. Because what's cool about argon, and we study this a little bit in the chemistry playlist, it is a noble gas, it is unreactive. And so when it is embedded in something that's in a liquid state it'll kind of just bubble out.
It's not bonded to anything, and so it'll just bubble out and just go out into the atmosphere. So what's interesting about this whole situation is you can imagine what happens during a volcanic eruption.
Let me draw a volcano here. So let's say that this is our volcano. And it erupts at some time in the past.
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So it erupts, and you have all of this lava flowing. That lava will contain some amount of potassium And actually, it'll already contain some amount of argon But what's neat about argon is that while it's lava, while it's in this liquid state-- so let's imagine this lava right over here.
It's a bunch of stuff right over here. I'll do the potassium And let me do it in a color that I haven't used yet. I'll do the potassium in magenta. It'll have some potassium in it. I'm maybe over doing it.
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It's a very scarce isotope. But it'll have some potassium in it. And it might already have some argon in it just like that. But argon is a noble gas. It's not going to bond anything. And while this lava is in a liquid state it's going to be able to bubble out. It'll just float to the top.
It has no bonds. And it'll just evaporate. I shouldn't say evaporate. It'll just bubble out essentially, because it's not bonded to anything, and it'll sort of just seep out while we are in a liquid state.
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And what's really interesting about that is that when you have these volcanic eruptions, and because this argon is seeping out, by the time this lava has hardened into volcanic rock-- and I'll do that volcanic rock in a different color. By the time it has hardened into volcanic rock all of the argon will be gone.
It won't be there anymore. And so what's neat is, this volcanic event, the fact that this rock has become liquid, it kind of resets the amount of argon there. So then you're only going to be left with potassium here. And that's why the argon is more interesting, because the calcium won't necessarily have seeped out. And there might have already been calcium here. So it won't necessarily seep out. But the argon will seep out. So it kind of resets it.
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A climate of internet-facilitated dating in later life has introduced more opportunities for unsafe sex, sexually transmitted disease STDsand general exploitation among vulnerable older adults Pierpaoli Parker, in progress. Ethical Considerations and Recommendations The rise of online social engagement and dating among older adults introduces interesting and complex ethical considerations for practitioners and geropsychologists, as well as those in training.
For example, when and how should clinicians go about reporting harm? Do clinicians have a duty to consider capacity in deciding whether to introduce online engagement? How do we assess capacity to engage in online dating?
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Some of these questions do not yet have answers and are in need of additional scholarly discussion and research. These considerations require that the clinician has an adequately informed of these issues; that is, requisite professional competence regarding the online social engagement and dating needs of their older adult clients: 1. Engage in open and transparent discussion with older adults about the benefits and risks of online social interactions. Then, give the client the opportunity to make a well-informed decision.
Together, review online security, safety, and reporting guidelines. Ensure that adults understand and appreciate the potential and likely consequences of sharing their personal information. Perhaps most important, encourage them to report anyone or anything suspicious. Provide contact information to appropriate reporting sources.
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Conclusion Social and online dating sites provide exciting and increasingly common avenues for older adults to connect with peers, including potential romantic partners. Such digital opportunities help to counter the otherwise shrinking social network that many older adults experience.
Clinicians working with older adults can play a valuable role in promoting and facilitating responsible technology use for adults pursuing increased social and romantic involvement. To maximize the benefits of clinical guidance, and to ensure older clients feel prepared to negotiate the advantages and risks of online engagement, psychologists must understand the common ethical obligations and challenges it presents.
In some practice contexts, professional competence may be incomplete if the clinician lacks familiarity with these issues. Additional scholarly discussion and research on this topic is needed.
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