Atoms of an element that contain different numbers of neutrons are called isotopes. Each isotope of a given element has thesame atomic number but a different mass number (A), which is the sum of the numbers of protons and neutrons.
Answer: In a half-cell is where occurs the either oxidation (loss of electrons) or reduction (gain of electrons) but not both.
Explanation:
1) In an electrolitic cell you can identify two half-cells.
2) In one half-cell occurs the oxidation
3) In the other half-cell occurs the reduction.
4) The half-cell where oxidation occurs is the anode.
In the anode the spieces increase its oxidation number, which is what oxidation means. Increasing the oxidation number means that the spieces is losing electrons.
5) The half-cell where reduction occurs is the cathode.
Reduction is the reduction of the oxidation number and this occurs due to the gain of electrons.
Answer:
a) Platinum > Beryllium > Aluminum > Magnesium > Potassium > Cesium
b) Cesium > Potassium > Magnesium > Aluminum > Beryllium > Platinum
c) Cesium > Potassium
Explanation:
We must recall that the frequency of an electromagnetic wave is directly proportional to its energy. Hence as the work function of the metal increases, the minimum frequency required for emission of electrons occur increases accordingly.
Similarly, the maximum wavelength required for electron emission to occur varies inversely as the work function of the metal hence the answer provided.
Lastly, only caesium and potassium has work function less than the energy of the incident photon hence only these two metals experience electron emission with the kinetic energy of electrons emitted from caesium greater than that emitted from potassium.
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