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The atom questions

The atom questions | form five Chemistry

Find The atom examination questions, form five Chemistry in acaproso.com

# Question
1

Why different atoms have different chemical properties. Briefly explain.


Short answers
2

Write the chemical symbol left ( _{A}^{Z} extrm{X} ight ) and orbital electronic configuration for the atoms described in the following table:

S/n Number of Neutrons Number of Electrons
(i) 13 11
(ii) 7 8
(iii) 17 18
(iv) 16 16

 


Short answers
3

Calculate the minimum energy required to remove an electron from the hydrogen atom in its ground state.


Mathematical Calculation
4

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


Short answers
5

Distinguish between the following:

  1. Isotopes and isotopy
  2. Azimuthal quantum number and magnetic quantum number.
  3. Atomic mass unit and relative atomic mass.

Short answers
6

The mass spectrographic measurements of an element X whose atomic number is 31 indicated peaks at 79.21, 11.2 and 9.59. The isotopic masses are 69, 70 and 71 atomic mass unit (a.m.u) respectively.

  1. Write the conventional symbols for the three isotopes.
  2. Calculate the relative atomic mass of X.
  3. Explain why atomic weights of elements are not whole numbers.

Mathematical Calculation
7

The mass number of two atoms, A and B with the same atomic number are 235 and 238 respectively. If A contains 143 neutrons in its nucleus , find the number of neutrons and electrons in B.


Mathematical Calculation
8

State the shortcomings of the Bohr`s atomic model.


Short answers
9

An electromagnetic radiation of wavelength 2420AA as sufficient to ionize the sodium. Calculate the ionization energy of sodium atom in kJmol-1.


Mathematical Calculation
10

Calculate the wave number of the longest wavelength transition in Balmer series of hydrogen.


Mathematical Calculation