Well if the change is reversible then it is a physical change, but if not then it is a chemical change.
Atomic Number is the same as the number of protons in an element.
Mass Number is the number of Protons + Neutrons in an element.
Atomic Number: 6 means 6 Protons
Mass Number: 15 means 15 atoms that are a proton/neutron.
We are given out of the 15 atoms, 6 of them are protons, so the other 9 must be Neutrons.
15 - 6 = 9 so there must be 9 Neutrons.
There are 9 Neutrons in atom's nucleus.
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Density = mass/volume = 2000/4000 = 0.5 grams/cm3. Hope this hopes!
It is soluble in water and slightly soluble in ethanol.
