What three things must happen in order for a theory to be formed? someone can give a resume?​

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

Abeaker with 2.00×102 ml of an acetic acid buffer with a ph of 5.000 is sitting on a benchtop. the total molarity of acid and conjugate base in this buffer is 0.100 m. a student adds 4.70 ml of a 0.360 m hcl solution to the beaker. how much will the ph change? the pka of acetic acid is 4.740.

The time that is taken by neptune once around the sun is called