Select the number of electrons each atom must gain or lose to have a full valence level. use the periodic table if you need . a calcium atom (ca) will a fluorine atom (f) will a lithium atom (li) will an argon atom (ar) will an aluminum atom (al) will

explain, this is already a question with answers but i would like an explanation.

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.