Question # 1:
Part A
How many electrons and protons in an atom of vanadium?
Answer # 1:
Atomic number = number of protons = 23
Mass number = number of protons + neutrons
Mass number = 51 g/mole
Number of neutrons = 51-23
Number of Neutrons = 28
Number of electrons = atomic number = 23
Question # 1:
Part B
Explain in 2 or 3 sentences how the atomic weight is what is reported.
Answer # 1: Atomic weight or atomic mass is basically the average mass of atoms of an element. Atomic mass is calculated by using the naturally occurring relative abundance of isotopes. Atomic weight determines the size of the atom. Atomic weight = mass of protons + mass of neutrons.
Question # 1:
Part C
Calculate the density of vanadium. The structure is BCC.
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Answer # 2:
In general we can see from the above graph carbon diffusivity in iron is much faster as compared to aluminum diffusivity in aluminum. At about 5000C diffusivity of carbon in iron and Al in Al as shown below:
Diffusing Specie Host Metal Diffusivity (m2/sec)
Carbon α- Fe 2.4E-12
Carbon - Fe 1.7E-10
Al Al 4.2E-14
Question # 2:
Part B
At around 900oC, why is there a jump in the diffusivity value of carbon in iron?
Answer # 2: During a diffusion jump, the interstitial atom transfers from one octahedral place to another. Midway between these two places, it is bounded by 4 atoms all at equivalent spaces from the foreign atom. The 4 atoms form a tetrahedron with the foreign atom at the center. This tetrahedral place has a wall to the movement of the interstitial atom. The tetrahedral formation is the actuated state for the jump, and the structure necessity acquires activation energy to cross the energy barrier.
Question # 2:
Part C
In general carbon diffusion in iron is much “faster” than aluminum diffusion in aluminum.
and [Mr = San) = 0.20. Which of the following wavefunctions are consistent with this description? (3) 15 (b) 25 (c) 3.9 (Ci) 2p (e) 31.? [0 3a' which of the following orbitals of F is closer in energy to the 1s orbital of hydrogen?
Rainbow table: It is a pre computed table for reversing cryptographic hash functions, usually for cracking password hashes. Tables are usually used in recovering a plaintext password up to a certain length consisting of a limited set of characters. Ransaomware: The system that doesn’t allows users to proceed until the payment is done is generally known as Ransaomware. RAT programmes: RAT stands for ¨Remote Administrative Tool¨, it is a malware software, that allows a remote operator to control a system.
5d10 5f6. 6s2 6p6. 7s2 6. Outline the chemical properties (including its position in the periodic table) Plutonium is placed 94th on the periodic table, which is equivalent to its atomic number.
To improve network communications between stores, head offices. Combine all stock databases into a single system on head office server, so staff can view the amount of stock and access most recent up to date data. This would drastically improve the communications between the several stores. To achieve this, all the individual LANS (Local area Network) from the stores must be connected to create a Wide area network, thus this WAN can be accessed through Telecommunications lease lines across the internet. Though for PVMS this type of method is expensive, but will significantly benefit from this change.
1. If there is poor communication in the workplace for example, schedule face-to-face meeting weekly. 2. If there is poor communication with friends, ask them what they do not understand and then broadly explain it again. 3.
We found this to be true due to the fact that lone pairs move to where there is the most space available. Water, for example has two lone pairs. As seen in the first diagram, the two lone pairs are depicted on the central atom oxygen, although not in their ultimate position. In the second diagram, we see where the lone pairs will ultimately end up, occupying the most possible space due to their repulsion of each other atop the central atom. This can also be seen with a molecule containing three atoms and one lone pair, such as Sulfur dioxide.
Next, there is mass this contains 5 sections in it these are: • challenge
The size of the pore matters as well. Diffusion is when the movement of molecules from an area of high concentration to an low area concentration. Osmosis is the movement of water
The atomic number of polonium is 84. The average atomic weight is 209. Polonium has 84 protons, 84 electrons, and 125 neutrons.
The underlying metal corrodes to re-create the oxide, and thus the metal loss continues. By definition, the rate of FAC depends on the flow velocity. FAC often affects carbon steel piping carrying ultra-pure, deoxygenated water or wet steam. Stainless steel does not suffer from FAC. FAC of carbon steel halts in the presence of small amount of oxygen dissolved in water.
Delocalization of electron density between the filled (bond or lone pair) Lewis type NBOs and empty anti-bonding non-Lewis NBOs calculated by NBO (Natural Bond Orbital) analyzing by B3LYP/3-21G*
Plot the energy values En in the vertical direction for n = 1, 2,3,4,5. Plot the orbital angular momentum quantum number in the horizontal direction for l = 0,1,2,3,4. For each n, show every allowed value of l. Label every energy level spectroscopically (1s, 2s, 2p, ...). Indicate the m degeneracy of each l level. Show that the total degeneracy of each En is n2.
The EB cross section for these compounds is evaluated using Lagrange’s interpolation technique, Seltzer-Berger’s [10] theoretical EB cross section data given for elements and the evaluated results of Zmod using the following expression ------- (3) Where lower case z is the atomic number of the element of known EB cross section z adjacent to the modified atomic number (Zmod) of the compound whose EB cross section is desired and upper case Z are atomic numbers of other elements of known EB cross section adjacent to Zmod. Seltzer-Berger’s [10] theoretical EB cross section data is based on Tseng-Pratt theory[11]. The number of EB photons of energy k when all of the incident electron energy T completely absorbed in thick target is given by Bethe and Heitler [12]
Similarly, carbon dioxide diffuses in the opposite direction. This process of gas exchange is so rapid as to be thought of as instantaneous . Control of
Since Dalton’s atomic theory was created in the early 1800’s people were fixed that this was in fact the correct structure of an atom. Recent discoveries however, have been led to disprove the original theory. In part one, although Dalton originally stated that atoms are indivisible, it is now known that atoms can be divisible due to them being made up of protons, neutrons and electrons. Other experiments by Ernest Rutherford, Hans Geiger and Ernest Marsden show that rather than an atom being a “solid, massy” particle they are in fact mostly made up of empty space. Part two of Dalton’s theory has also had to be modified after it was also proven that atoms of the same element may have different masses due to different isotopes of the same element being able to have varied numbers of neutrons.