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IB Chemistry Important questions of Atomic Structure


IB  Chemistry Important questions of Atomic Structure

  1. Energy levels for an electron in a hydrogen atom are

     A. evenly spaced.

B. farther apart near the nucleus.

     C. closer together near the nucleus.     

D.  arranged randomly.

  • How many valence electrons are present in an atom of an element with atomic number 16?

A.      2     B.       4        C.           6        D.          8

  • What is the total number of electrons in p orbitals in an atom of iodine?

           A. 5          B.      7          C.   17         D.   23

  • How many electrons are there in all the d orbitals in an atom of Calcium(Z=20)?

A.      2              B.          0         C.          8          D.        5

  • What is the electron configuration for an atom with Z = 22?

A.1s22s22p63s23p63d4      B.1s22s22p63s23p64s24p2

C.1s22s22p63s23p63d24p2    D.1s22s22p63s23p64s23d2 

  • Write the electron configuration for the copper(I) ion (Z = 29), Fe(II) ion( Z=26). [2]
  • How many orbitals are there in the n = 3 level of an atom? Show working. [2]
  • Give the formulas of two oppositely charged ions which have the same electron configuration as argon.[2]
  • Explain why successive ionization energies of an element increase.[1]
  • Explain how successive ionization energies account for the existence of three main energy levels in the sodium atom.[3]
  • Distinguish between a continuous spectrum and a line spectrum.[2]
  • Define the term relative atomic mass.[1]
  • Identify the numbers of protons, neutrons and electrons in the species 33S2–.[1]
  • The relative atomic mass of chlorine is 35.45. Calculate the percentage abundance of the two isotopes of chlorine, 35Cl and 37Cl in a sample of chlorine gas.[2]
  • State the meaning of the term isotopes of an element.[1]
  • The thinning of the ozone layer increases the amount of UV-B radiation that reaches the Earth’s surface.
Type of Radiation Wavelength / nm
UV-A 320–380
UV-B 290–320

       Based on the information in the table above explain why UV-B rays are more dangerous than UV-A.[3]

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