Does anybody know how to pass Level 16 of covalent bonding on collisions?

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

Schrodinger and heisenberg developed an alternate theory about atomic nature that contradicted some of bohr's model of the atom. how do changes resulting from new technology and evidence affect the reputation of the atomic theory?

Acrystal that absorvd water from air is (blank)a. aqueousb. homogenousc. hygroscopicd. efflorescent