Element M reacts with chlorine to form a compound ...

Question

Element M reacts with chlorine to form a compound with the formula MCl₂. Element M is more reactive than magnesium and has a smaller radius than barium. This element is __________.

A) Sr

B) K

C) Na

D) Ra

E) Be

Jules Bruno · Accepted Answer

Use the trends in metal reactivity and atomic radius to determine the identity of MFirst thing is to analyze the ionic compound that M can form. Notice that upon reaction with Cl, it forms MCl2.[readmore]Recall that in ionic compounds, the charge of the ion goes to the subscript of the counterionThis means the charge of M is +2. Therefore, it is possibly an alkali earth metal which has +2 as its cation form.For the reactivity, recall that the trend for the metallic character is as follows: it decreases from left to right and increases down a period in the periodic table. If M is more reactive than Mg, therefore, it is possibly Ca, Sr, Ba or RaThe last clue is that M has a smaller radius than Ba. Recall that atomic radius in the periodic table, it decreases going from left to right of a period and increases going down a groupIf it is smaller than Ba, then it is possibly Sr or CaTherefore, the answer is Sr (Ca is not in the choices)

Problem: Element M reacts with chlorine to form a compound with the formula MCl2. Element M is more reactive than magnesium and has a smaller radius than barium. This element is __________.A) SrB) KC) NaD) RaE) Be

FREE Expert Solution

Problem Details

Problem: Element M reacts with chlorine to form a compound with the formula MCl2. Element M is more reactive than magnesium and has a smaller radius than barium. This element is __________.A) SrB) KC) NaD) RaE) Be

FREE Expert Solution

Problem Details

Sign up for free to watch this video!