Which hypothesis of Thomson's atomic model was later found to be not true by Niels Bohr and why ?

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)

What four properties do all waves have in common

How does the value of the equilibrium constant show that a reaction reaches equilibrium very quickly? (a) the equilibrium constant is large. (b) the equilibrium constant is small. (c) the equilibrium constant is zero. (d) the value of the equilibrium constant does not show how quickly a reaction comes to equilibrium.