IB Chemistry Important questions of Atomic Structure
- 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?
- Write the electron configuration for the copper(I) ion (Z = 29), Fe(II) ion( Z=26). 
- How many orbitals are there in the n = 3 level of an atom? Show working. 
- Give the formulas of two oppositely charged ions which have the same electron configuration as argon.
- Explain why successive ionization energies of an element increase.
- Explain how successive ionization energies account for the existence of three main energy levels in the sodium atom.
- Distinguish between a continuous spectrum and a line spectrum.
- Define the term relative atomic mass.
- Identify the numbers of protons, neutrons and electrons in the species 33S2–.
- 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.
- State the meaning of the term isotopes of an element.
- The thinning of the ozone layer increases the amount of UV-B radiation that reaches the Earth’s surface.
|Type of Radiation||Wavelength / nm|
Based on the information in the table above explain why UV-B rays are more dangerous than UV-A.