Wednesday, May 9, 2018

halacha - Noled -- Ossur on Yom Tov, Muter on Shabbos?


Why is it that there apparently are some poskim (Halachic authorities) that hold Noled (something that didn't exist before the onset of Shabbos or Yom Tov) is Muter on Shabbos but Ossur on Yom Tov? (At the moment I don't have any good sources to back up this claim...)




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periodic trends - Comparing radii in lithium, beryllium, magnesium, aluminium and sodium ions

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{...