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Kayla Diederich
9/17/2012 07:02:29 am
Where do the electrons play a factor in atomic mass?
Rourke
9/17/2012 09:16:38 am
They done. Google electron mass verse proton or neutron mass.
Abbey Johnson
9/23/2012 11:34:08 pm
electrons have a negligible mass. they don't weigh enough to effect the mass #.
Megan Bishop
9/17/2012 07:11:15 am
Is the mass of the empty space and electrons ever taken into account when looking at the mass of the whole atom or would the very small mass added not make a difference?
Jake Schmidt
9/23/2012 11:29:39 pm
It is very small and is mostly empty space. The empty space has no mass to it and the electrons are also to small
Faith Barzyk
9/17/2012 07:30:20 am
Is the mass of all of the protons equal to the mass of the nucleous?
Laurel Payne
9/17/2012 08:25:04 am
No, you have to include the mass of the neutrons too to find the mass of the nucleus. Electrons are just disregarded because they have very little mass.
Katie Townsend
9/17/2012 07:43:02 am
Why don't electrons play a factor into the mass number?
Ben Evans
9/23/2012 11:33:16 pm
The mass of electrons is negligible compared to the mass of protons and neutrons.
Hunter
9/23/2012 11:40:14 pm
Electrons don't have any mass compared to the mass from the protons and neutrons in the nucleus.
Amanda Fulghum
9/17/2012 08:07:18 am
When figuring out atomic mass, will you be able to know all the different percents in order to make sure the number is correct?
Laurel Payne
9/24/2012 03:18:21 am
All you need to know is the # of protons and neutrons (what element it is and is it an isotope)
Lee Muglia
9/17/2012 08:07:34 am
I have the same question as a few other people: Why don't the electrons play a factor in the atomic weight? Is the mass of it so small that it is insignificant? I know Niels Bohr said that the nucleus determined the weight of the atom, but I am not sure how he came up with it.
Abbey Johnson
9/23/2012 11:36:01 pm
The mass of an electron is so small it's negligible. It doesn't have enough mass to affect the mass #.
Madison Job
9/17/2012 08:08:52 am
I do not understand how the percents from C 11 C12 and C13 were found.
Bruce Proctor
9/24/2012 03:19:48 am
It was probability of that atom having that composition
David Kasperski
9/24/2012 03:21:06 am
The percents are the amount of times an atom with that amount of electrons are found.
zeke fetty
9/17/2012 08:21:53 am
i understood quite a bit from whatching this video but like madison said how were the percents for C11 C12 and C13 found?
Rourke
9/17/2012 09:18:19 am
It was just an example, I was making up numbers to demonstrate how the mass number is found.
Ben Evans
9/17/2012 08:22:42 am
It was stated that the mass number shows the amount of the element on the earth. Does this mean that high mass number's are higher or lower amounts of that element?
Carly
9/24/2012 03:18:41 am
I think it means higher amounts of that element
Krista Wylin
9/17/2012 08:55:37 am
I don't understand why the number of neutrons is free to change whenever but the element still remains the same. Also, the way that all the different variations of Carbon added up to the mass number was a bit confusing. How is it able to do that and still make sense?
Rourke
9/17/2012 09:19:45 am
The number of neutrons and electrons does not determine an elements identity, does it. The identifier of an element is the number of protons.
Krista Wylin
9/17/2012 09:31:50 am
So, only the number of protons matters when determining the mass number?
Laurel Payne
9/24/2012 03:20:47 am
No, you still need neutrons for mass#, ATOMIC # is just the protons
jake schmidt
9/17/2012 09:19:25 am
Is the empty space in the atom made up of smaller atoms? Atoms make up everything so what is in that empty space in the atom around the electrons?
Rourke
9/17/2012 01:12:43 pm
Nothing, that's why it's called "empty"
Bailey Ernst
9/17/2012 09:21:00 am
How do scientists determine the amount of protons? Was there a certain experiment done? How did they come up with the ways to find the mass number or atomic number? I also did not understand how the percentiles were found with the C11, C12, and C13.
Amanda Fulghum
9/24/2012 03:21:49 am
The percents were made up. Also the amount of protons is the atomic number.
Rachel Kosek
9/24/2012 03:34:26 am
the percent is the probability of the atom having that composition
Carly Zebelian
9/17/2012 09:48:00 am
How do we know the abundance of each element on earth, to find the atomic mass?
Christina Szydlowski
9/23/2012 11:37:18 pm
Scientists
Ben Evans
9/23/2012 11:37:18 pm
After watching these videos, I noticed that it appeared to me that a lower atomic mass number would show a greater abundance of that element on earth. I only think this because synthetic elements have such large mass numbers but very low abundance levels on earth.
Chris Smith
9/17/2012 10:18:53 am
Where do the extra neutrons come from when an atom gains extra neutrons or even if the atom loses some? Do they come from another atom or someplace else?
Andrew Ruczynski
9/24/2012 03:26:04 am
I think that the atoms gain neutrons by fusion with other atoms which create more neutrons.
David Kasperski
9/17/2012 10:27:28 am
What makes up the other percent of types of carbon found? Would the extra amount of neutrons change the atom's identity, like making it become oxygen instead if it were to have a large amount of neutrons missing or gained?
Brendan Mantey
9/17/2012 10:46:15 am
I have the same question. Why dont we include the weight of the electrons
Chris Smith
9/24/2012 03:21:35 am
From research done online, the electrons have such little weight compared to the protons and neutrons that they are not included.
Laurel Payne
9/24/2012 03:22:55 am
Electrons are so tiny that theere mass does not really contribute anything to the mass of the atom (Plus, they change so much its hard to know exactly how many there are)
Nicole Sawitzky
9/25/2012 06:27:12 am
The electron's masses are so small, they don't contribute to the mass of the atom. Their masses are too small and too insignificant to include in the overall weight, 9/17/2012 11:38:14 am
How were the percentages from c11, c12, and c13 used to determine the atomic mass of carbon? I do not understand why these percents were used.
Bruce Proctor
9/24/2012 03:26:55 am
The percents were made up, the 11,12, and 13 determine the atomic mass
Lee Muglia
9/24/2012 03:33:27 am
The percentages from c11, c12,and c13 were used to help find the average mass of the element because when the number electrons change, they chaneg the mass of the element. The equation for to find the mass number is the atomic number/ the number of protons + the number of electrons. The percentages were examples that Mr. Rourke used. They percentages were from the amount of carbon out of an experiment that has a mass of of 14 or a mass of 12. These percentages were used as examples. From the percentages were then multiplied by the mass number to find the average.
Faith Barzyk
9/24/2012 03:35:02 am
Rourke just made up those percentages pretty much and they represent how many carbon atoms in the word have each amount of neutrons. You would then move the decima place on the percentage (ex. 98 = .98) and multiply it by the amount of neutrons plus the number of protons. do this for each percentage and then add them all together to get the mass number.
Allison Schweiger
9/17/2012 07:50:52 pm
I get that the mass of the nucleus is almost 100% of the atom, but why are the electrons not included into the mass number even if it is only a small % of the mass?
Carly Zebelian
9/24/2012 03:22:47 am
Because the electrons are such a small amount it doesnt have to be included
David Kasperski
9/24/2012 03:24:14 am
The electrons are not included in the mass because they are so small it wouldn't change the mass in anyway if they were or weren't present
Amanda Fulghum
9/24/2012 03:24:51 am
The reason that electrons are not counted in the atomic mass is because the amount is so small that is does not make much of a difference>
Sara Campbell
9/17/2012 11:04:03 pm
So mass number is protons x 2? Like usually?
Megan Bishop
9/23/2012 11:38:51 pm
Usually, this will work. If there is more or less neutrons to form an isotope though, this is not always the case. Then the number of protons and neutrons would need to be added to find the mass. Leave a Reply. | ArchivesSeptember 2013 Categories |
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