Which statement best describes how atoms combine to form sodium chloride (NaCl)?
2 answers:
Answer: Option (D) is the correct answer.
Explanation:
A bond generated after transfer of an electron from one atom to another is known as an ionic bond. And, a bond generated by sharing of electron(s) between two atoms is known as a covalent bond.
Sodium is a metal with atomic number 11 and electronic distribution 2, 8, 1. On the other hand, chlorine is a non-metal with atomic number 17 and electronic distribution 2, 8, 7.
So, in order to attain stability sodium will lose one electron and develop a positive charge as . Whereas chlorine at the same time will take up one electron from sodium atom and acquire a negative charge as
.
Thus, we can conclude that the statement a positively charged sodium ion and a negatively charged chlorine ion form an ionic bond.
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Half-life time of a reaction is time at which reactant concentration becomes half of its initial value.
Half-life of the first order reaction is 20 min. Rate constant can be calculated as follows:
The rate expression for first order reaction is as follows:
initial number of molecules of reactant are , time is 100 min thus, putting the values to calculate number of reactant at time 100 min,
On rearranging,
Or,
Therefore, number of molecules unreacted will be