How do the elements exhibit a range of band gaps?

Q: Why is Visible radiation able to remove electrons from sodium but not from zinc?

A: Photoelectric effect: It states that the when light falls on a metal surface it emits electrons.…

Q: what is the wavelength of a hydrogen Balmer series proton for m=4 and n=2? Use the rydberg formula

A:

Q: The ionization energy of hydrogen is 1313 kJ/mol. Covert this energy to: a) wavelength (nm) b)…

A:

Q: Just how does a selenium photocopier function?

A:

Q: Define forbidden energy gap.

A:

Q: A certain element has its outermost electron in a 3p subshell. It has valence +3 because it has…

A: It is given that the element has its outermost electrons in a 3p subshell and has +3 valency.

Q: What 2 factors are the source of an atom's magnetic field?

A: The magnetism of a solid originates from the electrons of atoms. As the electrons (which is a…

Q: The value of the alpha factor for photons is * 1 2

A: Given: Asked for the alpha factor of photons.

Q: How can elements with low atomic numbers have so many spectral lines?

A: The electron in the lower level orbit jumps into higher level orbit when an extra amount of energy…

Q: If electrons are ejected from a given metal when irradiated with a 10-W red laser pointer, what will…

A: Given data: Power rating of red laser is, P=10 W. Power rating of green laser is, P'=5 W.

Q: Describe the important concepts of Series elements?

A: Series element

Q: Why do lithium, potassium, and sodium exhibit similar chemical properties?

A: Given:  Lithium, potassium, sodium

Q: Calculate the minimum voltage required to excite the following lines. The numbers are the wavelength…

A: a) Formula Used: The formula to calculate the minimum voltage required for the excitation of k lines…

Q: What is the wavelength (in nm) of the least energetic spectralline in the infrared series of the H…

A: Using Rydberg’s equation,

Q: The work function for silver is 4.60 eV. Convert into energy in Joules.

A:

Q: Why do you think that the energy level in the n- region is lower than the p-region?

A: The n-type region has trivalent impurity while a p-type region has pentavalent impurity.

Q: It is relatively easy to strip the outer elections from a heavy atom like that of uranium (which…

A: YES, It is relatively easy to remove outer electrons from a heavy atom like uranium, but it is very…

Q: If atoms exist, why can’t we see them with visible light?

A:

Q: If two electrons in the same ațom have the same four quantum numbers, then they must have the same

A: The four quantum numbers of an atom are n, l, m , ms.

Q: Calculate the ionization energy of doubly ionized litihium Li2+ which has Z=3.

A:

Q: If the element in the last problem has energy levels E, = 2.54 x 10 18 J and E2 = 2.2 x 10 18 J,…

A: E1 = 2.54×10-18 J E2 = 2.2×10-18 J difference of energy levels = E1 - E2= 2.54×10-18 -  2.2×10-18 J=…

Q: Compare atomic emission spectroscopy with atomic absorption spectroscopy in terms of the…

A: Spectroscopy is a technique for studying atomic and molecular structures. Spectra is generated by…

Q: What are the masses of sulfur’s two most dominant isotopes?  Which ones are capable of generating…

A:

Q: If the radius of the nucleus R = 12x 10^-13 cm, and known it is 1 fermi = 10^-13 cm, the nuclear…

A: GivenRadius of nucleus =12×10-13  cmand 1 Fermi=10-13 cm

Q: Why is -1/5g is nigative here

A:

Q: What are the workings of a selenium photocopier?

A: Selenium is used extensively in electronics as selenium has good photovoltaic and photoconductive…

Q: Why is infrared spectrophotometry a good method for identifying a pure chemical substance, whereas…

A: Infrared spectrophotometry a good method for identifying a pure chemical substance cause,

Q: Suppose an unknown element has an absorption spectrum with lines corresponding to 2.5, 4.7, and 5.1…

A: To find: (a) Suppose an unknown element has an absorption spectrum with lines corresponding to 2.5,…

Q: Write A Short Note On Beta Particles

A: Beta particles (also referred to as beta radiation or beta rays, denoted by the symbol β) can be…

Q: What accounts for the difference in penetration ability with regard to the type of emission and the…

A: Different Types of radioactive emission: Alpha rays Beta rays Gamma rays

Q: An atom of silver has closed 3d and 4d subshells.Which subshell has the greater number of electrons,…

A: Silver has closed 3d and 4d sub shells. This implies both sub shells contain the maximum number of…

Q: How many subshells PrinciPal quantum level n=3? are in

A:

Q: Given: Molybdenum has a BCC crystal structure, an atomic radius of 0.1363 nm, and an atomic weight…

A: Given : atomic weight of Molybdenum, A = 95.64 g/mol Molybdenum has a BCC crystal structure. So the…

Q: How many possible values of ms can there be in an atom with n = 3?

A:

Q: Refer to Exercise 12.3(b) and calculate the wavelength that would result from replacing the oxygen…

A: Given, Dioxygen molecule

Q: What are the two longest wavelengths in the absorption spectrum of sodium? What are the transitions?

A: Absorption spectroscopy is a spectroscopic technique and the outcome is absorption spectrum. It is…

Q: Why does the transition of Ninitial=4 to Nfinal=5 of a hydrogen atom result in the absorption of the…

A: Required : Why does the transition of Ninitial =4 to Nfinal =5 of a hydrogen atom result in the…

Q: Annotate the IR spectra by labelling each of the major peaks as a functional group.

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Q: How many electrons can occupy (a) the 2p subshell and (b) the3p subshell?

A: In the p shell, there are 3 subshells, and each sub shell contains 2 electrons.

Q: Why is the section of the periodic table labeled as “transition elements” exactly 10 elements wide…

A: To determine: Why in the periodic table labelled as "transition elements"

The Bohr model

Students often get confused between Rutherford’s model and Bohr model of an atom. They interpret the postulates of both these models to be the same, which is incorrect. Rutherford’s model differs from Bohr’s model in the following ways: