An atom's reactivity is determined by the number of electrons in its outermost shell. Because the outer shell can hold up to eight electrons and not all elements are able to fill these shells to capacity, the fullness of the shells will determine the volatility of the atom's reactive properties as a result of the number of electrons required to complete the shell.Know More
Atoms with low reactivity have full atom shells. The noble gases, including neon, argon and krypton, fall into this category, as they are atoms that naturally present with full electron shells and are not looking to gain or lose electrons to achieve a balanced outer shell.
Atoms with high reactivity have outer shells that are imbalanced because of a low number of electrons (one or two) or a higher but not full number (six or seven). The most highly reactive elements are halogens, which are looking to gain one more electron, and alkali metals, which are looking to lose the single electron in their outer shells.Learn more about Chemistry
Elements in the same group of the periodic table have similar properties because their electronic configurations have the same number of electrons in the outermost shell. Elemental behavior is almost completely reliant on this outermost shell configuration, with inner shells playing a less important role in determining properties.Full Answer >
Each of the alkaline earth metals reacts with HCl, also known as hydrochloric acid, to form hydrogen gas and its corresponding metal chloride solution. The reaction becomes stronger the further down the group the element is on the periodic table.Full Answer >
The climate is determined by a number of factors, including how the atmosphere, oceans and continents react to the solar radiation that heats the planet. The oceans play a major role in determining long-term climate, as they transport and release stored heat slowly over hundreds of years.Full Answer >
The identity of an element is determined by the total number of protons present in the nucleus of an atom contained in that particular element. An atom is the smallest fundamental unit of an element.Full Answer >