IBChem questions of Atomic Structure

IBChem questions of Atomic Structure: Try these questions below.

  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.

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

A.      2    

B.       4       

C.           6       

D.          8

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

A. 5         

B.      7          

C.   17        

D.   23

4. 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

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





  • 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]

How do you find IBChem Important questions of Atomic Structure?

IB Diploma chemistry Book

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