Who invented the Yahrtzeit tablet (panel)?
At first glance, this could not have been common before 150 years ago, as there is no room to place candles where the electric lights go.
Who invented it, and is it mentioned anywhere in seforim?
Apparently the of last four, $\ce{Mg^2+}$ is closest in radius to $\ce{Li+}$. Is this true, and if so, why would a whole larger shell ($\ce{...
No comments:
Post a Comment