Which is the electron configuration for bromine?
1s22s 2p 3s23p 4s3d104p5
1s22s 2p 3s 3p 4s%3d104p
1s²2s22p 3s?3p 4s%3d104p5
1s22s²2p%3s23p4523d4p5
HURRRY

Which statement about the stamps is correct?

When 225mg of anthracene, c14h10(s), was burned in a bomb calorimeter the temperature rose by 1.75k. calculate the calorimeter constant. by how much will the temperature rise when 125mg of phenol, c6h5oh(s), is burned in the calorimeter under the same conditions? (δch< (c14h10,s)=–7061 kj mol−1.)

In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?