10) which group of elements shows the elements in order of increasing reactivity Need answers for 10 and 11

What neutral atom is isoelectronic to mn+4

The minerals found in bones are deposited by living cells called

Amixture initially contains a, b, and c in the following concentrations: [a] = 0.300 m , [b] = 1.05 m , and [c] = 0.550 m . the following reaction occurs and equilibrium is established: a+2b⇌c at equilibrium, [a] = 0.140 m and [c] = 0.710 m . calculate the value of the equilibrium constant, kc.