If alpha,beta roots of x2-4x+1 find the value 1/alpha+1/beta - alpha beta?
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If alpha,beta roots of x2-4x+1 find the value 1/alpha+1/beta - alpha beta?
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Answer:
The ionic radius of the Sr2+ ion is 132pm, while the ionic radius of the K+ ion is 152pm. Why is this the case? I would have thought that since K+ has one less shell of electrons than Sr2+, its radius would be significantly smaller.