Answer:
Discovery of neutron
Explanation:
Until 1932, the atom was believed to be composed of a positively charged nucleus surrounded by negatively charged electrons, after successful discovery of electron by J.J. Thompson and proton by Ernest Rutherford.
In 1932, James Chadwick bombarded beryllium atoms with alpha particles.
As Chadwick had previously seen in experiment conducted by Frédéric and Irène Joliot-Curie, they had bombarded a sample of beryllium with alpha radiation.
Chadwick repeated the experiment and observed an unknown radiation, this showed no deflection what-so-ever.
He repeated this experiment by bombarding other materials, like helium, nitrogen and lithium,
Finally, Chadwick found that this radiation was composed of particles with a neutral electrical charge and had approximate mass of a proton.
This particle was then known as the neutron.
Answer:
method
Explanation:
Fusion
It is the one that make the most sense
When studying the
movement of heat, what does the term "system" refer to any quantity
of matter of fixed identity of the chosen study. “Surroundings" refer to
the rest of the universe beyond the boundary of your chosen study or system.
We want to write the nuclear equation for the beta decay of Aluminium-25.
The equation is:
![^{25}_{13}Al \implies ^{25}_{14}Si + ^{0}_{-1}e](https://tex.z-dn.net/?f=%5E%7B25%7D_%7B13%7DAl%20%5Cimplies%20%5E%7B25%7D_%7B14%7DSi%20%2B%20%20%20%5E%7B0%7D_%7B-1%7De)
First, as you may know, in a beta decay the number of protons is increased by one. Aluminium has 13 of them, so after the decay, we will have 14 protons.
This means that the aluminium will transform into silicon, then the nuclear equation is just:
![^{25}_{13}Al \implies ^{25}_{14}Si + ^{0}_{-1}e](https://tex.z-dn.net/?f=%5E%7B25%7D_%7B13%7DAl%20%5Cimplies%20%5E%7B25%7D_%7B14%7DSi%20%2B%20%20%20%5E%7B0%7D_%7B-1%7De)
Where the:
![^{0}_{-1}e](https://tex.z-dn.net/?f=%5E%7B0%7D_%7B-1%7De)
Is an electron, which is the emitted particle in the beta decay.
If you want to learn more, you can read:
brainly.com/question/4184205