Sodium is harder than potassium metal . Explain?

The smaller the atom in term of atomic radius,the higher the melting point of an element and hence the greater the metallic bond in the metals . Sodium has a smaller atomic radius ( atomic radius of the Alkali metals increases down the group) than potassium metal, therefore the orbital are nearer to the nucleus with positive protons which holds them ( orbitals) firmly. Potassium has a bigger radius therefore the electrons are not held strongly or firmly to the nucleus therefore they are loosely held . This means that sodium atom requires alot of energy to break than potassium atom

• Assumptions of the kinetic molecular theory of ideal gas .
  Gases are made up of independent particles (atoms or molecules)Continue reading “Assumptions of the kinetic molecular theory of ideal gas .”