Explain why a weighted average is used instead of an arithmetic (regular) average.

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.

Answer it was we, the the whole people, who formed the union. and we formed it, not to give the blessings of liberty, but to secure them: not to the half of ourselves and the half of our posterity, but to the whole people- women as well as men.

Ahigh energy (high speed) particle (alpha or beta or neutron) are shot at the target;