
Concept explainers
Introduction:
The number of neutrons present in the given isotopes is to be determined.
Concept introduction:
The number of neutrons in an atom is defined as the difference between the mass number and the number of protons..
The
The mass number
mass number
The accepted way to denote the atomic number and mass number of an atom of an element (X) is as follows:
Here,

Answer to Problem 28QP
Solution: 119, 27, 33, 9, 72, 78, 23, 24, 13, 17, 47, 56
Explanation of Solution
For
From the periodic table, the atomic number of gold is
For
From the periodic table, the atomic number of calcium is
For
From the periodic table, the atomic number of cobalt is
For
From the periodic table, the atomic number of fluorine is
For
From the periodic table, the atomic number of iodine is
For
From the periodic table, the atomic number of iodine is
For
From the periodic table, the atomic number of potassium is
For
From the periodic table, the atomic number of potassium is
For
From the periodic table, the atomic number of potassium is
For
From the periodic table, the atomic number of phosphorus is
For
From the periodic table, the atomic number of strontium is
For
From the periodic table, the atomic number of potassium is
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Chapter 2 Solutions
CHEMISTRY >CUSTOM<
- (a) Draw the structures of A and B in the following reaction. (i) NaNH2, NH3(1) A + B (ii) H3O+arrow_forwardFor the reaction 2 N2O5(g) → 4 NO2(g) + O2(g), the following mechanism has been proposed: N2O5 →> NO₂+ NO3_(K1) NO2 + NO3 → N2O5 (k-1) NO2 + NO3 → → NO2 + O2 + NO (K2) NO + N2O5- NO2 + NO2 + NO2 (K3) d[N₂O5] __2k‚k₂[N2O5] Indicate whether the following rate expression is acceptable: dt k₁₁+ k₂arrow_forwardConsider the following decomposition reaction of N2O5(g): For the reaction 2 N2O5(g) → 4 NO2(g) + O2(g), the following mechanism has been proposed: N2O5 → NO2 + NO3 (K1) NO2 + NO3 → N2O5 (k-1) NO2 + NO3 → NO2 + O2 + NO (K2) NO + N2O5 → NO2 + NO2 + NO2 (K3) Indicate whether the following rate expression is acceptable: d[N2O5] = -k₁[N₂O₂] + K¸₁[NO₂][NO3] - K¸[NO₂]³ dtarrow_forward
- In a reaction of A + B to give C, another compound other than A, B or C may appear in the kinetic equation.arrow_forwardFor the reaction 2 N2O5(g) → 4 NO2(g) + O2(g), the following mechanism has been proposed: N2O5 →> NO₂+ NO3_(K1) NO2 + NO3 → N2O5 (k-1) NO2 + NO3 → → NO2 + O2 + NO (K2) NO + N2O5- NO2 + NO2 + NO2 (K3) d[N₂O5] __2k‚k₂[N2O5] Indicate whether the following rate expression is acceptable: dt k₁₁+ k₂arrow_forwardGiven the reaction R + Q → P, indicate the rate law with respect to R, with respect to P and with respect to P.arrow_forward
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