Physics, 31.10.2019 01:31 hsandshsands2329

99pts. i can't find isotope, pottasium-15 or k-15. is this even possible, i have a fill-in-the-blanks worksheet with a table like example:

element name: nitrogen-20 symbol: n-20 atomic number: 7 atomic mass: 20 charge: 0 protons: 7 neutrons: 13 electrons: 7

i remember finding the isotope number, nitrogen-20 by adding the protons and neutrons, then i get a new atomic mass. but on here pottasium-15 is confusing! what neutrons do i add from 19 protons to get 15? sometimes the teacher throws in impossible problems.

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Yes, that's what [s]he has done this time.

First of all, the number of protons in every atom of an element
is the same. That's the "Atomic number" of the element. If
somehow the nucleus of the atom gained or lost a proton, then
that would change the Atomic number of the atom, and it would
be an atom of a different element.

Potassium is element #19. Every atom of Potassium has 19 protons
in its nucleus. Any atom that has 19 protons in its nucleus is an atom
of Potassium, and any atom that has more or less than 19 protons in
its nucleus is an atom of some other element, not Potassium.

In addition to protons, atoms also have some neutrons in the
nucleus. Neutrons have no charge, so they don't change the
atomic number of the atom. But they have mass ... almost the
same as the mass of a proton ... so the neutrons add to the atom's
"atomic weight". The atomic weight of an atom is

(number of protons) plus (number of neutrons).

The numbers you see next to the names are the atomic weights.
Notice that the atomic weight of an atom of Potassium can't be
less than 19 ... in order for it to be Potassium in the first place,
it has 19 protons, so its atomic weight would be 19 even if it had
no neutrons at all.

There can be no such thing as an atom of Potassium-15.

Atoms of the same element can have different numbers of
neutrons in their nucleii. Those are called "isotopes" of the
element.

There are three isotopes of Potassium that occur in nature ...
atoms with 19 protons plus 20, 21, or 22 neutrons. So the
atomic weight of any naturally occurring atom of Potassium
is either 39, 40, or 41. If you ever see a big chart that lists
natural isotopes of the elements, then in slot-#19, you'll see
Potassium-39, Potassium-40, and Potassium-41.

I hope my explanation is good enough for 50 points.

Answer from: Quest

elly's long hair:

a. if the salon only takes cash, then this isn't the problem. it doesn't matter how much she has in her checking account. she can't get a haircut until she has the cash.

b. if she has overdraft protection, then there's no problem. she can go ahead and write a check that her account can't cover, then sometime later, pay the bank some outrageous usury for loaning her a few bucks for a few days, but with beautiful hair.

c. if elly has some principles, and doesn't want to write a bad check, then now she has a problem. her desire for the new hairstyle is in conflict with her honesty and integrity.

d. if the bank will not process a check she writes, then even if she had a million $$ in her account, she couldn't use any of it. the amount she has in her account is not the problem. and if i may suggest, she might as well close her checking account, and put the money where it'll work for her. it's not doing her a bit of good in a checking account, since she can't write any checks.

justin can't pay the full balance:

a. he can't even handle the credit limit he has now. under no circumstances should he ask for a higher limit.

b. he can ask for the grace period to be extended. but that's no solution, the bank will almost certainly refuse anyway, and there are much better options. he knew the rules of his credit card when he started using it.

c. he definitely should pay the interest on the balance, plus as much of the balance as he can cover at the same time.

d. he definitely should pay the minimum otherwise they could shut down his card. he should also pay as much more as he possibly can. he should also remember the awkward situation he's in, stop buying stuff on credit that he can't afford, and avoid adding any more debt.

i'd say that justin's best best option isn't on this list of choices. what he has to do: pay as much as he can at least the minimum payment plus as much more as he can and then avoid adding more debt.

Answer from: Quest

the displacement produced by the body.

the amount of force subjected to the body.

the angle between the direction of force and displacement

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99pts. i can't find isotope, pottasium-15 or k-15. is this even possible, i have a fill-in-the-blank...

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