A piece of metal (mass = 125.0 g) at 101 °C is placed in a styrofoam coffee cup containing 75.0 g of water at 21 °C . After several minutes the temperature stops changing and is found to be 31 °C. Assuming that no heat was lost to the cup or the surroundings, what is the specific heat capacity of the metal? The specific heat capacity of water = 4.184 J/g°C.

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.

the answer is c. nacl

you need to stop taking that class

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.