What is the difference in atomic volume between $Au$ and $Cu$ in $22$ carat gold jewelry?

In chromyl chloride,the number of $d$-electrons present on chromium is same as in (Given atomic number of $Ti = 22, V = 23, Cr = 24, Mn = 25, Fe = 26$)

Which of the following statements is correct regarding $d-$block elements?

For the transition elements $Cr, Mn, Fe,$ and $Co$,the correct order of the negative values of $E^o_{M^{2+}/M}$ is:

Why does zinc not exhibit variable oxidation states?

Those elements whose two outermost orbitals are incompletely filled with electrons are known as: