Sunday, August 19, 2018

tefilla - How do you improve your Kavvanah [concentration]?



Building on my blog post here, I ask: How do you improve your concentration when davening?




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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{...