Objectives-There is often much confusion between goals and objectives. Whereas as a goal is a description of a destination, an objective is a measure of the progress that is needed to get to the destination. The following table serves to illustrate the difference between goals and objectives.
Group VIIIA (new Group 18) are called the noble gases. They used to be called the inert gases, but Neil Bartlett at UC, Berkeley showed that the noble gases could be made into compounds. Their reactivity is minimal. The noble gases are; Helium, Neon, Argon, Krypton, Xenon, and Radon. Radon is toxic, as it is radioactive. The other elements that are gases at room temperature are: fluorine, F2; chlorine, Cl2; oxygen, O2; nitrogen, N2; and hydrogen, H2. All these gases are diatomic. The halogens, fluorine and chlorine, are highly reactive, and very toxic. Oxygen and nitrogen are reactive, or can be made to react. They are not toxic per se. Hydrogen is, of course, very reactive. Hydrogen and nitrogen are not toxic, but they will suffocate you, as would the noble gases, if you ingested pure forms of them, and your oxygen supply was quenched.
The Noble Gases. Group 18/0 â The Noble gases The Noble Gases Group 18/0 â The Noble gases Group 18âThe Noble Gases The Group18 elements are called the noble gases. Representative Elements 2 This is because they rarely combine with other elements and are found only as uncombined elements in nature. Their reactivity is very low.