The density of a substance is given by the formula ρ = m/v, where m is the mass of the substance, and v is the volume.
ρ = m/v
ρ = 3.1 g / 4.1 mL
ρ = 31/41 g/mL = 0.756 g/mL = 0.756 g/cm^3
A nucleus of mass number 81 contains 46 neutrons
Mass number=number of protons+number of neutrons
81=number of protons+ 46
number of protons=81-46
number of protons=35
In an atom, number of electrons=number of protons=35
So, the element is ⁸¹Br₃₅ .
Atomic ion of Br, having 36 electrons in it will be:
⁸¹Br⁻₃₆
The symbol for this atomic ion will be Br and charge on the ion will be -ve.
<span>It rises confidence for the reason that the more times you conduct the similar experiment over and over should either demonstrate your hypothesis right and wrong and remove any random incidences that might touch your results. Meaning it permits to have a more accurate measure or conclusion.</span>
If it's to balance the equation then it's already balanced.
