In covalent bonds, atoms share electrons. These shared electrons are known as, well, covalent bonds!
In a covalent bond, each atom contributes one electron, meaning that for every bond, there are 2 electrons residing in it.
Definitions:
A single bond is a covalent bond that contains 2 electrons.
A double bond is a covalent bond that contains 4 electrons
A triple bond is a covalent bond that contains 6 electrons
It's very common for atoms to not use all of their electrons while bonding, which means that some will be left out and aren't used in any bonds. These are called lone pairs.
Definition:
A lone pair is a pair of electrons that aren't used in bonding, and therefore remain with its original atom.
Answer:
The correct answer is - palatine tonsils
.
Explanation:
Palatine tonsils or more normally tonsils are the pair of soft tissue masses of highlighted secondary lymphatic tissue present on the lateral wall of the oropharynx in the tonsilar fossa just below to the soft plate. It is the lymphatic tissue that is located to inferior to the soft plate.
Thus, the correct answer is - palatine tonsils.
The question is incomplete, here is the complete question.
A chemist prepares a solution of copper(II) fluoride by measuring out 0.0498 g of copper(II) fluoride into a 100.0mL volumetric flask and filling the flask to the mark with water.
Calculate the concentration in mol/L of the chemist's copper(II) fluoride solution. Round your answer to 3 significant digits.
<u>Answer:</u> The concentration of copper fluoride in the solution is 
<u>Explanation:</u>
To calculate the molarity of solute, we use the equation:

We are given:
Given mass of copper (II) fluoride = 0.0498 g
Molar mass of copper (II) fluoride = 101.54 g/mol
Volume of solution = 100.0 mL
Putting values in above equation, we get:

Hence, the concentration of copper fluoride in the solution is 