Swimming pools must have a certain amount of chlorine content. The United States standard for safe levels of chlorine in swimming pools is at least part per million and no greater than parts per million. Write a compound inequality for the acceptable range of chlorine levels.

Let =chlorine level in a swimming pool (in parts per million) ≤≤

what is the volume occupied by 40 grams of argon gas (ar) at standard conditions? what volume, in liters, is occupied by 1.5 x 1023 

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.