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Your Questions About How To Discover New Elements

Sharon asks…

how to get half a mole?

So in chemistry we are talking about moles. I am getting a little confused when if comes to them.
A question that came up on a worksheet was: a new element is discovered. The IUPAC decides to call it fordium. How many atoms are in a half mole of this new element?
I really don’t understand how to get half of a mole at all
could some please help me

New Niche Finder answers:

To understand this question you need to understand what a mole is.

A mole is the number 6.0221415 × 10^23. It can be applied to single atoms or full molecules.

So regardless of what type of atom it is (Carbon/Hydrogen, etc).
A mole of carbon is 6.0221415 × 10^23 carbon ATOMS
A mole of hydrogen is 6.0221415 × 10^23 hydrogen ATOMS.

So take half of that number and that is your answer :)

Maria asks…

Creating a new element?

For a science assignment, i need to talk about a new element that has been discovered on an alien planet. I have to describe how it fits on the periodic table. i need to state its atomic mass, atomic number, and its physical and chemical properties. Any ideas? :3 it can be non-synthetic since its on an alien planet, and not earth. and it can be a metal, metalloid or nonmetal.

New Niche Finder answers:

Look at an atomic table of elements. Make up a new element that has a higher atomic number than any on the chart. Figure out where it would be placed on the chart by its atomic number and electron configuration, and thus make predictions of it properties by what column it would be in. You can do it.

Nancy asks…

chemistry final!!!!! need help with study guide ?s?

please answer any if u can will be very helpful my final is tom and im stuck on theses ?s
!!!!!
thank u
11. Chemists and physicists have studied the emission of radiation from radioactive isotopes. Which is not an
example of how this research has been applied to medicine? a) detection of thyroid problems with
iodine-131 b) production of insulin through recombinant DNA c) nuclear magnetic resonance scanners
d) radiation therapy for cancer
12. Where on the periodic table are naturally occurring radioactive elements most generally found?
13. Carbon-14 is used to date artifacts produced by early humans. An archaeologist measured the percentage of
carbon-14 found in samples from four locations. Which location is the oldest?
Location A B C D
Percentage of Original Carbon-14 13 25 7 50
14. Carbon-14 has a half-life of 5,715 years. How much of a 128 mg sample of carbon-14 will remain after 17,145
years?
15. Iodine-131, a radioisotope, has a half-life of 8 days. If the amount of iodine-131 in a sample is 10.0 g, how
much iodine-131 will remain after 32 days?
16. Which type of ionizing radiation can be blocked by clothing?
17. Which of the following has a 2+ charge? a) alpha particle b) beta particle c) neutrino d) gamma
ray
18. The equation
2
 E mc is used to calculate what?
19. Give the correct order of nuclear radiation with the most energy to the the least energy.
20. An isotope that undergoes radioactive decay a) always has a very short half-life. b) has an unstable
nucleus. c) will not be found in nature. d) will not participate in a chemical reaction
21. Which type of radiation has no mass and no charge?
22. Some people have raised concerns about the use of recombinant DNA to alter food crops. Which of the
following is most likely to be a reason for their concern? a) Altered plants will grow too slowly, producing
smaller crops. b) Consumers will have too many types of food to choose from, causing confusion.
c) Genetic changes could cross into other plants with unpredictable results. d) Modified plants may be too
sensitive to pesticides.
23. Protons and neutrons are bound together in the nucleus by what?
Atomic and Molecular Structure
24. The nucleus of an atom is (positively or negatively) charged and has a (high or low) density
25. Why did theories about the structure of the atom have to be revised after the publication of Rutherford’s gold foil
experiment results?
26. Suppose scientists discovered a stable new element in Group 17. How many valence electrons would it
have?
27. As one moves from the red end of the visible spectrum to the violet end, the energy a) decreases
b) increases c) does not change d) can’t be predicted
28. What were the results obtained in Rutherford’s gold foil experiment?
29. What was Bohr’s contribution to the development of atomic structure?
30. The characteristic bright-line spectrum of an element is produced when electrons do what?
31. Which elements have an electron configuration that makes it unlikely to react with other atoms?
32. How many valence electrons do each of the following atoms have? a) Ba b) Ga c) F d) I
33. Thomson performed an experiment where he discovered that cathode rays are deflected by a magnet and
attracted by a positively charged plate. What did this prove about the particles that make up the rays?

New Niche Finder answers:

28. What were the results obtained in Rutherford’s gold foil experiment?
A beam of alpha particles, generated by the radioactive decay of radium, was directed normally onto a sheet of very thin gold foil. The gold foil was surrounded by a circular sheet of zinc sulfide (ZnS) which was used as a detector: the ZnS sheet would light up when hit with alpha particles. Under the prevailing plum pudding model, the alpha particles should all have been deflected by, at most, a few degrees; measuring the pattern of scattered particles was expected to provide information about the distribution of charge within the atom. However they observed that a very small percentage of particles were deflected through angles much larger than 90 degrees. According to Rutherford:

It was quite the most incredible event that has ever happened to me in my life. It was almost as incredible as if you fired a 15-inch shell at a piece of tissue paper and it came back and hit you. On consideration, I realized that this scattering backward must be the result of a single collision, and when I made calculations I saw that it was impossible to get anything of that order of magnitude unless you took a system in which the greater part of the mass of the atom was concentrated in a minute nucleus. It was then that I had the idea of an atom with a minute massive center, carrying a charge.—Ernest Rutherford

You seem to have forgotten the rule you accepted when you signed up to Yahoo Answers .. You can ask ONE question for one lot of your points. Seems fair to me so I’ve just answered one of the twenty two you posted.

Richard asks…

science question… help!?

1. how might an atom of oxygen fill its outermost energy level?

2. suppose a new element was discovered and scientists were interested in the way it would bond with other elements. why would it be important to find the correct place for the element in the periodic table?

New Niche Finder answers:

Dunno about number one, but number two because all the elements in the periodic table are in the places they are in becuase they all relate to the elements that they are grouped with, so they all have similar properties.

Lizzie asks…

Hey im studing for exam and a need the correct answers for these chemistry quetions?

a) What is the symbol and atomic number for the element, sulfur?
b) What noble gas has the closest atomic number?
c) How many electrons will sulfur lose or gain to form a stable ion?
d) What charge of ion will result
22. A new element has been discovered, and all you know is that it it a halogen
a) Predict its state at room temperature
b)Predict the number of electrons in its outer orbit?
c)Predict its possible atomic #. On what do you base your prediction?

2. Which one of the following describse the proton in the modern atomic model?
a) – charge and significant mass.
b) + charge and very small mass.
c) – charge and located in the nucleus
d) positive chargew and significant mass
e) neutral charge and found in nuclues
8. Which of the following combinations describe the electron in the modern atomic model?
a) – charge and significant mass.
b) + charge and located in orbit
d) + charge and significant mass.
e) neutral charge & found in orbit about the nucleus

New Niche Finder answers:

A)symbol is S, atomic no. Is 16.
B)closest to the nobel gas argon(Ar=18).
C) and d) S gains 2 electrons to form S^-2 ion, but in covalent stage it show +6,+4,+2,0 and -2 oxidation states.
22-a)gas
b)7 electrons in outermost shell.
C)its atomic no. Is 117.
2-d)
8-a)

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