What type of particle is potassium sulfate

Which of the following statements is true about planck’s law

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

Draw any one of the skeletal structures of a 2° alkyl bromide having the molecular formula of c6h13br and two stereogenic centers. indicate chirality by using wedge and hashed wedge notation. lone pairs do not need to be shown.