Ions of two isotopes of iron are
$^{53}$Fe$^{2+}$ $^{56}$Fe$^{2+}$
Which statement is correct?
1 )
The ions of both the isotopes have the electronic configuration 1s$^2$2s$^2$2p$^6$3s$^2$ 3p$^6$4s$^2$3d$^6$
2 )
The ions of both the isotopes contains 26 neutrons
3 )
$^{53}$Fe$^{2+}$ has fewer protons than $^{56}$Fe$^{2+}$
After acceleration to the same kinetic energy $^{56}$Fe$^{2+}$ will move more slowly than $^{53}$Fe$^{2+}$
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