What would you notice about the dot diagram of an unstable element?

Write the chemical symbols for three different atoms or atomic cations with 27 electrons. asap!

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.

Answer asap need it by wednesday morning calculate the ph of 0.02m hcl best answer will be brainliest