Physics

Problem

Arrange the following nuclei in order of decreasing nuclear stability (highest to lowest):

^{4}\!\text{He}

^{56}\!\text{Fe}

^{23}\!\text{Na}

^{238}\!\text{U}

. a)

^{56}\!\text{Fe} \;>\; ^{4}\!\text{He} \;>\; ^{23}\!\text{Na} \;>\; ^{238}\!\text{U}

^{4}\!\text{He} \;>\; ^{56}\!\text{Fe} \;>\; ^{23}\!\text{Na} \;>\; ^{238}\!\text{U}

^{56}\!\text{Fe} \;>\; ^{23}\!\text{Na} \;>\; ^{238}\!\text{U} \;>\; ^{4}\!\text{He}

^{56}\!\text{Fe} \;>\; ^{23}\!\text{Na} \;>\; ^{4}\!\text{He} \;>\; ^{238}\!\text{U}