An atom has an atomic mass of 27 and 13 neutrons , how many electrons will this atom have?

When a septic tank backs up a goes in to clean it out

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?

The table lists the lattice energies of some compounds. compoundlattice energy (kj/mol)lif            –1,036licl            –853naf            –923kf            –821nacl            –786which statement about crystal lattice energy is  best  supported by the information in the table? the lattice energy increases as cations get smaller, as shown by lif and kf. the lattice energy increases as the cations get larger, as shown by lif and licl. the lattice energy decreases as cations get smaller, as shown by nacl and naf. the lattice energy decreases as the cations get smaller, as shown by naf and kf.