The first inert gas to be isolated was argon, in 1894. Argon was found to have an atomic weight of slightly less than 40. Which of the following proposed changes to Mendeleev's original periodic table were supported by the properties of argon. I. Calcium should no longer be considered one of the alkaline earth metals

II. Another group of elements should be added to the periodic table.

III. The peridocity of elements should depend atomic number rather than atomic weight.

During which time interval does the object travel approximately 10 meters

Identify one disadvantage to each of the following models of electron configuration: -dot structures -arrow and line diagrams -written electron configurations type in your answer below. (answer) -dot structures do not show the distribution of electrons in orbitals and take up a lot of space. -arrow and line diagrams take up a lot of space and make it difficult to count electrons. -written configurations make it easy to lose count of electrons and do not show the distribution of electrons in orbitals.

Which material burns faster? metal aluminum