The atom questions | form five Chemistry

(a) Use s,p,d,f  notation to designate atomic orbitals with the given pairs of quantum numbers n and l.

1. n =2 and l=1
2. n =3 and l=2
3. n =4 and l=3
4. n =3 and l=0

(b) For the following sets of quantum numbers , state which are allowable and which are not allowable. Briefly explain your answer.

(a) Define the following phrases

1. Atomic number
2. Mass number

(b) Clearly state four postulates of Planck`s quantum theory as derived from black body radiation.

A nucleus of a certain element is presented as . What is the number of electrons and neutrons in atom X?. Show your work clearly.

Sketch a hydrogen spectral series based on Bohr atom energy level.

1. How does a mass spectograph of a pure element is used to detect the presence of isotopes?
2. The following data were obtained for a certain pure element

Calculate the relative atomic mass of an element.

1. Use wave and particle models for energy of a particle to derive the de Broglie equation.
2. Calculate the wave length of an -particle having mass of moving with a speed of . Show your work clearly including manipulations of units.

Study carefully the Bohr`s atomic model of hydrogen atom shown below then answer the questions that follow.

1. State three postulates which led Bohr`s atomic model. Include mathematical expressions, if any , which qualify the postulate.
2. In a single sketch of Bohr`s atom, show how Lyman and Paschen spectral series are formed.

The energy difference between ground and excited state atoms of a certain element was found to be J. Calculate the wavelength and wavenumbe of the photons that excited the atoms. Show your work clearly including manipulations of units.

Dalton`s atomic theory consists of four main postulates. For each of the two postulates given below, briefly describe an experiment or discovery which is against the postulate.

1. Atoms can neither be created nor destroyed
2. All atoms of the same element are alike.

State four postulates of Dalton’s atomic theory.