What type of bond occurs when two atoms share one pair of valence electrons?
2 answers:
Answer: A single covalent bond is formed when two atoms share one pair of valence electrons.
Explanation: There is two types of bonding, ionic bonding and covalent bonding.
An ionic bond is formed between a metal and a non metal where a metal gives it's valence electron to the non metal. For example, In NaCl, Na is a metal with one valence electron and Cl is a non metal with seven valence electrons. Na gives its one valence electron to Cl and both of these get their nearest noble gas like electron configurations.
On the other hand, A covalent bond is formed by the sharing of electrons between two non metals.
If one pair of valence electrons is shared between two atoms then we call it single covalent bond and it is shown by a single line between two atoms.
Examples:- H-H, Cl-Cl etc
If two pairs of valence electrons are shared between two atoms then it is known as double covalent bond and if three pairs of electrons are shared between two atoms then it is known as triple covalent bond.
Example of double bond is and for triple bond it is
.
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This is an incomplete question, here is a complete question.
Distinguish between Accuracy and Precision Question Jamie is measuring the mass of one mole of carbon. She measures the mass 4 times, achieving the following measurements: 11.86 g, 11.87 g, 11.89 g, and 11.90 g. If the accepted value of one mole of carbon is 12.11 g, how can Jamie's measurements best be described?
Select the correct answer below:
Jamie's measurements are both precise and accurate,
Jamie's measurements are accurate but not precise.
Jamie's measurements are precise but not accurate,
Jamie's measurements are neither precise nor accurate,
Answer : The correct option is, Jamie's measurements are precise but not accurate.
Explanation :
Accuracy : It is defined as the closeness of a measured value to a standard or known value.
For Example: If the mass of a substance is 50 kg and one person weighed 48 kg and another person weighed 55 kg. Then, the weight measured by first person is more accurate.
Precision : It is defined as the closeness of two or more measurements to each other.
For Example: If you weigh a given substance five times and you get 1.8 kg each time. Then the measurement is said to be precise.
Level of precision is determined by the maximum number of decimal places.
As we are given that:
The measurements are, 11.86, 11.87, 11.89 and 11.90
The accepted value is, 12.11
The average of these values =
From this we conclude that, these measurements are close to each other that means they are precise. But the accepted value are not equal to average of four values that means they are not accurate.
Hence, the correct option is, Jamie's measurements are precise but not accurate.