Quote from sweetnsour321

ahh~ someone help me with this!! I have limited to send this in! someone help me
I can't find the answer!! ;_;
😢
help meh~
this is the question --> http://tinypic.com/r/2zfrcjt/7

So you're trying to match the shaded boxes with electron configurations?
Swap 7s2_6d2 with 7s2_5f14_6d2 and 7s2_514_6d2 with 7s2_5f14 then you should be good.

"When we remember we are all mad, the mysteries disappear and life stands explained."

• Samuel Clemens/Mark Twain

Quote from true_grave_unit

Quote from sweetnsour321

ahh~ someone help me with this!! I have limited to send this in! someone help me
I can't find the answer!! ;_;
😢
help meh~
this is the question --> http://tinypic.com/r/2zfrcjt/7

So you're trying to match the shaded boxes with electron configurations?
Swap 7s2_6d2 with 7s2_5f14_6d2 and 7s2_514_6d2 with 7s2_5f14 then you should be good.

oh my gosh thank you!! your a life savior!!! may good luck shine on you forever and ever~
My goodness thank you your a genius ~!!! (or maybe i'm just stupid lol)

[img]http://i742.photobucket.com/albums/xx63/coco6431/Apol186067.jpg[/img]]
I hear you say "Why?" Always "Why?" You see things; and you say "Why?" But I dream things that never were; and I say "Why not?"

What are two ways that atoms can be made to emit electromagnetic emissions?

It's a question on my Chemistry Lab Report. I know when electrons go down an energy level they emit stuff, but I don't know another.
Thanks.

"Well done. Here come the test results: "You are a horrible person." That’s what it says. We weren’t even testing for that." -GLaDOS, Portal 2

Wasn't there something about absorbing a photon to have it ionised (dunno about the english term for that) - an electron will become free that way...
Been a while since I've finished school, better not take my word for granted.

Quote from Gill987

What are two ways that atoms can be made to emit electromagnetic emissions?

It's a question on my Chemistry Lab Report. I know when electrons go down an energy level they emit stuff, but I don't know another.
Thanks.

You got the gist of it: you're trying to excite an electron so that it goes up an energy level then promptly falls back down, releasing light/electromagnetic radiation. I don't think there's another "way" for an atom to emit light besides electron excitation. My guess is that the answer you're really probably looking for is ways to excite an electron, which are:

1. Have it absorb energy from photon, like 0sirt said, with just the right frequency.
2. Have it absorb energy from a collision with another atom or ion.

There's a "third" way by applying heat, but it only really applies to solids like metals, which vibrate fast enough that they glow and emit light. Otherwise, heat would just increase the number of collisions, which I've mentioned already.

Some sources I consulted: [url]http://en.wikipedia.org/wiki/Electron_excitation[/url] and [url]http://astro.unl.edu/naap/hydrogen/levels.html[/url]

"When we remember we are all mad, the mysteries disappear and life stands explained."

• Samuel Clemens/Mark Twain

I'm doing an essay for english and I need to know what it means to have the righs of life, liberty, and the pursuit of happiness, can anyone help me out? >.<

Quote from neonkitty

I'm doing an essay for english and I need to know what it means to have the righs of life, liberty, and the pursuit of happiness, can anyone help me out? >.<

Does not sound like a scientific fact.
What does it mean to you?
Freedom, equality, karma?

Quote from Mamsmilk

Quote from neonkitty

I'm doing an essay for english and I need to know what it means to have the righs of life, liberty, and the pursuit of happiness, can anyone help me out? >.<

Does not sound like a scientific fact.
What does it mean to you?
Freedom, equality, karma?

Who said anything about science 😕

Anyhow, the rights of life, liberty and the pursuit of happiness are sometimes quoted as being the basic rights that everyone should be granted. In other words, everyone should be allowed to live, be free and try to make themselves happy (as long as they don't obstruct other people's rights).

"It is those who know little, and not those who know much, who so positively assert that this or that problem will never be solved by science."

Quote from Mamsmilk

Quote from neonkitty

I'm doing an essay for english and I need to know what it means to have the righs of life, liberty, and the pursuit of happiness, can anyone help me out? >.<

Does not sound like a scientific fact.
What does it mean to you?
Freedom, equality, karma?

ah-ha..they are words from the declaration of independence. nd the essay isn't about what the words mean to me but their actual meaning. x.X

edit: nvm, i got it. and thanks to mattai. (:

Alright...I need some help with my Java homework. lol

EDIT:
Ok, I got answers. XD

♪MONSTARR~ will eat all your cookies and steal your bishies~♪ Φ_Φ

I need to double check something.

So, is the curvature of a vector also considered a vector?

[color=green]"Officially, this machine doesn't exist, you didn't get it from me,
and I don't know you. Make sure it doesn't leave the building."[/color]

Quote from Toto

I need to double check something.

So, is the curvature of a vector also considered a vector?

No, i think not. http://www.cs.mtu.edu/~shene/COURSES/cs3621/NOTES/curves/normal.html

curvature of a circle would be a constant wouldn't it? if it was a vector, where would the curvature vector point?

Gay book discussion thread

Quote from you_no_see_me_

this is not about cannibalism...please get back on topic

Quote from Toto

I think it is exactly the topic. I see nothing wrong.

Anyone good with physics?

The radioactive isotope iodine-131 has a half-life of 8 days. It is given to patients for medical diagnosis of the kidneys. It has an activity of 800kBq at the time it is given to the patient.

Calculate
i) the activity 24 hrs after given to the patient
[color=red]ANS = 7.3x10^(5)Bq[/color]

ii) the activity when prepared 24 hrs before given to the patient
[color=red]ANS = 8.7x10^(5)Bq[/color]

**iii) the mass of iodine-131 when it was prepared
[color=red]ANS = 1.9x10^(-13)kg[/color]

I'm stuck on part iii. What I did was:

λ = ln(2) / (8x24x3600) = 1x10^(-6)
N = (8.7x10^(5)) / (1x10^-6)) = 8.7x10^(11)
m = (8.7x10^(11)).(131) / (6.022x10^(23)) = 1.9x10^(-10)kg**

I'm a couple of decimal places out so I'm not sure if it's my mistake or the book's...
Any help, please.

Quote from leloMew

m = (8.7x10^(11)).(131) / (6.022x10^(23)) = 1.9x10^(-10)kg[/b]

Redo the calculation as your numbers do work out to 1.9*10^-13. I think you just typed something in wrong.

Quote from story645

Quote from leloMew

m = (8.7x10^(11)).(131) / (6.022x10^(23)) = 1.9x10^(-10)kg[/b]

Redo the calculation as your numbers do work out to 10^-13. I think you just typed something in wrong.

lol, are you sure it's not 42?

Gay book discussion thread

Quote from you_no_see_me_

this is not about cannibalism...please get back on topic

Quote from Toto

I think it is exactly the topic. I see nothing wrong.