Answer:

Explanation:
Half time is period required to desintegrating the half of the initial number of atoms. Then, the total time is:


Answer:
in the periodic table we can see that the ions of Cl is greater than the ions in Na
Answer:
Option B: as the distance between the objects increases the Force of gravity decreases
Answer: Electron
Explanation:
An orbital is a region in an atom where there is a high probability of finding an electron.
In order to conduct the two-slit experiment with a beam of electrons, the slit opening has to be smaller than the opening for the light waves. This is because the wavelength of the electron beam is lower, which means it will pass through the large slit without diffracting. Diffraction will occur if the spacing is reduced. The reason that electrons have a smaller wavelength is because they have a higher energy than light waves.