The atom questions | form five Chemistry

Distinguish between the following:

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

Answer / Solution

UNSOLVED

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.

Answer / Solution

UNSOLVED

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.

Answer / Solution

UNSOLVED

State the shortcomings of the Bohr`s atomic model.

Answer / Solution

UNSOLVED

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

Answer / Solution

UNSOLVED