Part B Mendeleev placed thallium (TI) in the same group as lithium (Li), sodium (Na), potassium (K), rubidium (Rb), and cesium (Cs). However, the modern periodic table doesn't place thallium in this group. Use the periodic table to find the properties of thallium. Explain why Mendeleev might have grouped thallium in the same group as lithium and sodium. Also explain how thallium is different from the other five elements. В I U x Font Sizes 三星 E三三 囲。 X, A - A Characters used: 0/ 15000 V 5:57 !!!

Consider two different elements, element 1 and element 2. Element 1 has both a smaller radius and a smaller molar mass than element 2. What accounts for their differences in radius?

Write the electron configuration for cobalt (atomic number 27).

A chemical reaction occurs in three stages. Each stage consists of a mix of positively and negatively charged elements. Some of those elements react by bonding together, but each pair can only consist of 1 negatively charged and 1 positively charged element. Some elements can exist by themselves without bonding with other elements. In the chemical reaction, there are 8 elements (Z, Y, X, W, V, U, T, S). In the first reaction, two pairings were made: Z bonded to T, and U bonded to X. In the third reaction, V bonded to S. The reaction only consisted of three negatively charged elements. Which of the following statements is false? Pick ONE option Y must be positively charged V must be positively charged W must be positively charged T, X, and S could possibly be negatively charged OT, X, and 5 could possibly be positively charged ►

Classify each element below as belonging to the representative elements, transition elements, or inner transition elements. Thorium (Th) Magnesium (Mg) Copper (Cu)

Place the following elements in order of increasing covalent radius (i.e., from smallest to largest): Aluminum (Al) Boron (B) Fluorine (F) Helium (He) Potassium (K)