1) The atomic mass of the element is the weighted average of all the isotopes
= { (isotope mass x percentage abundance) } / 100
= [ (53.9396 x 5.845 ) + (55.9349 x 91.754) + ( 56.9354 x 2.119) + ( 57.933 x 0.282) ] / 100
= [315.276962 + 5132.2508146 + 120. 6461126 + 16.337106 ] / 100
= 55.8451
= 55.85
Thus the atomic weight of the unknown element is 55.85 g / mol
2) The atomic weight of 55.85 is corresponds to the element Iron.
Thus the unknown element is Iron ( Fe )
3)
All the isotopes has the same atomic number. The mass number varies.
Number of protons = number of electrons = Atomic number = 26 for all the isotopes.
The number of neutrons = mass number - number of protons
= mass number - atomic number
The results are tablulated.
4)
The complete electronic configuration is given by
since the number of electrons are the same for all the isotopes, their electronic configurations are identical. Hence there is no need of writing electronic configuration for each isotope.
5)
The orbital diagram is as follows:
6) The position of the 23rd electron is in the 3d orbital.because 20 electrons occupy upto 4S orbital. The next 6 electrons are in the 3d orbital.
Hence n = 3
since l = n-1 = 3-1 = 2
The detailed positions of the 6 electrons in the 3d orbital are given below:
m(l) has the values +2, +1, 0 , -1,-2. The 23rd electron occupies the middle of the 3d orbital and hence its m(l) value is 0
It is an unpaired electron with positive spin. Hence m(s) = +1/2
Thus the four quantum numbers of the 23rd electron are
n = 3, l = 2 , m(l) = 0 and m(s) = +1/2
-----------------------------------------------------------------------------------------------
Please help me understand how to do this? Im very confused on how to do this...
-Isotopes are represented by the symbol , where Z is the atomic number, A is the mass number, and E is the elemental symbol. . Write symbol that represents an isotope of nickel that contains 28 protons and 32 neutrons in the nucleus. Isotopes are also represented by the notation: Name-A, where Name is the name of the of the isotope. An example of this isotope notation is magnesium-26. This represents an isotope of The extremely small size of atoms...
Atoms and Isotopes 1 Activity: Atoms and Isotopes Why? Atoms and isotopes are identified by the numbers of protons, electrons, and neutrons that they contain The number of protons, electrons, and neutrons in atoms determines the chemical properties of the elements .A knowledge of the number of protons and electrons in an atom will help you understand how atoms combine to form molecules Identify the composition of atoms in terms of protons, neutrons, and electrons Use atomic symbols to represent...
Lab Section 1 2 3 4 5 6 7 8 9 Report: Quantum Numbers Assigning Quantum Numbers 1. For each element, complete the following tables Write the ground state condensed electron configuration, draw the energy level orbital diagram (see partial example with Na), and write the quantum numbers for the last electron in the atom. Element Me Condensede continuration Energy level Cuantum numbers Element Condensede configuration Energy level orbital diagram Quantum numbers (laste) Flement Condensede Energy level orbital diagram Quantum...
numbers (last e) 2 Considering the energy level diagrams in the previous question, circle the correct word to complete each statement. In a phosphorus atom, the 3p orbitals are ( higher lower / equal ) in energy compared a. to the 3s orbital. b. In a phosphorus atom, the 3p orbitals are ( equal / not equal) in energy to each other. c. Phosphorus has a ( higher / lower / equal ) number of unpaired electrons than silicon. d....
Report: Quantum Numbers Assigning Quantum Numbers 1. For each element, complete the following tables. Write the ground state condensed electron configuration, draw the energy level orbital diagram (see partial example with Na), and write the quantum numbers for the "last" electron in the atom. Element - Na Mg Condensed e configuration NC [NC] 35 Energy level orbital diagram (Ne) Quantum numbers (last e) 1300 / 300 / Si Element ised e configuration P Ve 3²38 Ne 35² 3p' ve 35²...
3) If given the following quantum numbers, which element(s) do they likely refer to? (Assuming thot these quantum numbers describe the volence electrons in the element) Complete the table by writing only the symbol of the possible elements Possible Elements 0 4) Suppose that an atom fills its orbitals as shown: 1s 2s 2p Such an electron configuration illustrates which of the following rules? Hund's rule B) Aufbau principle C) Bohr model D) Pauli Exclusion principle and mJ tat best...
Cap Resources Suppose you take a trip to a distant universe and find that the periodic table there is derived from an arrangement of quantum numbers different from the one on Earth. The rules in that universe are: 1. principal quantum number n 1,2,... (as on Earth); 2. angular momentum quantum number 0,1,2,... ,n- 1 (as on Earth); 3. magnetic quantum number me = 0, 1,2, ...,l (only positive integers up to and including are allowed); 4. spin quantum number...
4 For each elemens, eomplese the folowing able. Element Condensed e configuration U(2-92 Po (2 4 Bh (Z107 Energy level orbital diagram Quantum numbers (last e) Note: For the "last electron" in Uranium,, give the last electron in the f-block. 5 Identify the number of protons and electrons contained in each element or ion. Then write the condensed electron configuration and give the four quantum numbers (n, 1, m, m) that describe the "last" electron in each species. Quantum numbers...
3. mer How many electrons in an atom can have each of the following quantum designations! 2 fourth period and forbital C. -41-3m--12 d. 3p 4. (pt) Why does the size of atoms increase going down a group on the periodic table? 5. (pt) What is a quanta of energy? 6. (pt) How does an atom generate atomic emission spectra? 7. (pt) Rank the following in order of increasing first ionization energies Ge, K. C S and Si X (pt...
The last question is what is the atomic number of the second noble gas? Suppose you take a trip to a distant universe and find that the periodic table there is derived from an arrangement of quantum numbers different from the one on Earth. The rules in that universe are: 1. principal quantum number n = 1,2,... (as on Earth); 2. angular momentum quantum number / = 0,1,2,...,n - 1 (as on Earth); 3. magnetic quantum number me = 0,1,2,...,f...