Brackett Series

1) Lines in the Brackett series of the hydrogen spectrum are cause by emission of energry accompanying the fall of an electron from outer shells to the fourth shell. The lines can be calculated using the Balmer-Rydberg equation. See Attachement for equation where m = 4, R = 1.097 x 10-2nm-1 , and n is an integer greater th ...continues

Quantum Numbers

Which of the following combinations of quantum numbers can refer to an electron in a ground-state cobalt atom (Z=27) ? a) n = 3, l = 0, m1 = 2 b) n = 4, l = 2, m1 = -2 c) n = 3, l = 1, m1 = 0

Wavelength

1) A hydrogen atom with an electron in the first shell (n = 1) absorbs ultraviolet light with a wavelength of 1.03 x 10-7 m. To what shell does the electron jump? Question also in attachment

Electronic Configurations

What are the likely ground-state electron configurations of the following anions? a) Se 2- b) N 3-

Lattice Energy

Calculate the lattice energy for CaH2 (in kilojoules per mole) using the following information: Eea for H = -72.8 kj / mol Ei1 for Ca = +589.8 kj / mol Ei2 for Ca = +1145 kj / mol Heat of sublimation for Ca = +178.2 kj / mol Bond dissociation energy for H2 = +435.9 kj / mol Net energy change for the formation of CaH2 from ...continues

Ions/Electrons

The following ions all have the same number of electrons: See attached file for full problem description. Order them according to their expected size, and explain answer.

electronic structure

Consider the electronic structure of the element bismuth. a) The first ionization energy of bismuth is Ei1 = +703 kJ / mol. What is the longest possible wavelength of light that could ionize an atom of bismuth? b) Write the electronic configurations of neutral Bi and Bi+ cation. c) What are the n and l quantum numbers of the ...continues

BALANCED EQUATIONS

Sulphur Dioxide + Oxygen = Sulphur Trioxide Chemical symbols for this are: SO2 + O = SO3 Is this a balanced equation? If not, how do i balance it?

The environmental protection agency (EPA) has proposed a new standard for microparticulates in air: a) how many of these particles are in your room? b)How many of these particles are in each 0.52-L breath you take?

The environmental protection agency (EPA) has proposed a new standard for microparticulates in air: For particles up to 2.5 um in diameter, the maximum allowable amount is 50 ug/m3. a) If your 9.2 ft x 13.8 ft x 8.6 ft dorm room just meets the new EPA standard, how many of these particles are in your room? (Assume the particle ...continues

Octet Rule

Which of the following substances contains an atom that does not follow the octet rule?See attached for multiple choice answers