Question

1) write the electron-dot notation for the following elements: 17Cl3Li1N13Al2) write Lewis structurs for "HCl" 3) what the difference between "polar covalent bond" and "non-polar covalent bond".

Answer 1

1) To write the electron-dot notation, you should know the number of valence electrons of the element. You can see that in the periodic table, we have groups that are the columns. The number of columns represents the valence electrons. For example, chlorine, the seventeenth element of the table contains 7 valence electrons because chlorine is in the seventh column on the table. Its electron-dot notation would be:

For Li (lithium), we have 1 valence electron because Li is in the first column in the table, its electron-dot notation is:

Nitrogen is in the fifth column, so they have 5 valence electrons, in the electron-dot notation it is going to have 5 electrons:

And finally, Al is in the third column in the periodic table, so they would have 3 electrons in their valence: