Find the nuclear symbol for Germanium-75

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17

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 empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?