Four main-group elements a, b, c and d are highlighted in the outline of the Periodic Table below: List these elements below in order of decreasing atomic radius. For example, if an atom of a is the biggest, and b the next biggest, then your list should start a, b, ... Important: don't try to figure out exactly which elements are marked, and then use your knowledge of the properties of each specific element. You don't need to. You will also be marked wrong for any answer, correct or not, that can't be determined from only the rough location of each marked element in the Periodic Table. 0000 X

2.42 What is a period in the periodic table? From what does it derive its name?

2.84 Early attempts to arrange the elements often focused on atomic weight. Mendeleev considered a number of properties in addition to atomic weight, so he realized that some elements seemed out of place when ordered by atomic weight. Using the modern periodic table, identify elements for which Mendeleev must have had to switch the order in order to get the correct sequence of elements.

What refinements had to be made in Daltons atomic theory to account for Gay-Lussacs results on the combining volumes of gases?

2.96 Use the web to look up the density of different forms of steel, such as stainless steel or magnetic steel, and discuss whether or not the differences in the densities follow what might he predicted by looking at the periodic properties of elements.

2.40 What distinguished the work of Mendeleev that caused scientists to accept his concept of the periodic table when others before him were not believed?

Four main-group elements a, b, c and d are highlighted in the outline of the Periodic Table below: List these elements below in order of decreasing atomic radius. For example, if an atom of a is the biggest, and b the next biggest, then your list should start b, ... a d X a с Important: don't try to figure out exactly which elements are marked, and then use your knowledge of the properties of each specific element. You don't need to. You will also be marked wrong for any answer, correct or not, that can't be determined from only the rough location of each marked element in the Periodic Table. 0.000 b S

Four main-group elements a, b, c and d are highlighted in the outline of the Periodic Table below: с 日 a b d List these elements below in order of decreasing atomic radius. For example, if an atom of a is the biggest, and b the next biggest, then your list should start a, b, ... Important: don't try to figure out exactly which elements are marked, and then use your knowledge of the properties of each specific element. You don't need to. You will also be marked wrong for any answer, correct or not, that can't be determined from only the rough location of each marked element in the Periodic Table. 1-1-4-1

Two main-group elements are highlighted in the outline of the Periodic Table below: What can you say about these elements without knowing exactly which they are? Use that knowledge to answer the questions in the following table, if possible. Important: do not try to figure out exactly which elements are marked, and then use your knowledge of the properties of each specific element. You don't need to. You will also be marked wrong for any answer, correct or not, that can't be determined from the rough location of each marked element in the Periodic Table. Element X Element Y Which element in the gas phase is more likely to glow green or yellow in a flame? X 5 O Can't say without more information. O Element X Which element is more likely to form an ionic compound with chlorine? O Element Y O Can't say without more information. O Element X Which element in the solid state is probably brittle, so that it breaks before bending? Element Y Can't say without more information. Explanation Check

In Groups 1A-7A, name all elements in each group that has the smallest atomic radius?