Distinguish between metals, ionic compounds, and covalent compounds using information about the physical properties of a compound.
Metal Compounds:
- Metal compounds have very High melting and boiling points
- They are good Conductors of heat and electricity
- They can be converted into different shapes without any breakage.
- They are ductile and magnetic.
Ionic compounds
- Ionic compounds exist in a crystalline structure that is stable. Hence, they higher melting and boiling points than covalent compounds.
- They don't conduct electricity when they are as ionic compounds. But, when they are dissolved in water the solution becomes conductor of electricity.
- These compounds exist as solids only.
- These compounds are Non magnetic.
Covalent compounds
- They have lower belting and boiling points when compared to ionic bonds.
- Covalent compounds are non conductor of electricity.
- They can take any form like liquid, solid or gas.
- They are Non magnetic.
Answer:
Option c: Possible electron energy states are quantized within an atom.
Explanation:
The Bohr's Model of the hydrogen atom consisted of the movements of the electrons around the positively-charged nucleus in circular orbits that have a certain energy state. The energy of that orbit is given by:

<em>Where:</em>
E(n): is the energy of an electron in a particular orbit
R: is the Rydberg constant
h: is the Plank constant
c: is the speed of light
n: is a positive integer which corresponds to the number of the orbit
The ground state energy of a electron in the hydrogen atom is equal to -13,6 eV.
Bohr's Model aims to propose that the electron is restrictedly to occupy a certain region in the atom.
Therefore, the conclusion of Bohr after observing emission spectrum lines is that "possible electron energy states are quantized within an atom", so the correct option is c.
I hope it helps you!