The electronic configuration of an element is 1s2s22p6. How many valence electrons does it have?

Which three statements represent the benefits of performing experiments using computer simulations?

Calculate the concentration of all species in a 0.165 m solution of h2co3.

Give a real-world example of an energy transformation that uses two of the following forms of energy: chemical, mechanical, nuclear, gravitational, radiant, electrical, thermal (heat), and/or sound.