Answer the following questions about the characteristics of the elements in Group 2 (the alkaline earths).

How do they react with iodine?
How do they react with water?
How do they react with oxygen?
Which reacts the most vigorously?
Which element in the group is the most metallic in character?

sorry, didn't mean to post twice lol computer glitched XD

I would look in a text for periodic trends and find my answer there.

1. How do they react with iodine?

The elements in Group 2, the alkaline earths, react with iodine to form metal iodides. This reaction involves a single displacement reaction where the alkaline earth metal displaces iodine from its compound. For example, if iodine is in the form of solid iodine crystals, it reacts with an alkaline earth metal, X, as follows:
X + I2 -> Xl2

2. How do they react with water?
The elements in Group 2 react with water, but the reactivity varies among the different elements. Generally, they react slowly with cold water to form metal hydroxides, releasing hydrogen gas. The reaction can be represented as:
X + 2H2O -> X(OH)2 + H2
However, the reactivity increases down the group. Beryllium does not readily react with water, while calcium reacts more vigorously.

3. How do they react with oxygen?
The elements in Group 2 react with oxygen to form metal oxides. The reaction involves the alkaline earth metal combining with oxygen to form a metal oxide. The equation for this reaction is typically:
2X + O2 -> 2XO
where X represents the alkaline earth metal.

4. Which reacts the most vigorously?
Among the elements in Group 2, calcium (Ca) reacts the most vigorously with both water and oxygen. Calcium has the highest reactivity as compared to the other alkaline earth metals in this group.

5. Which element in the group is the most metallic in character?
The element in Group 2 that is the most metallic in character is beryllium (Be). Beryllium exhibits more characteristic metallic properties such as high electrical conductivity, malleability, and ductility compared to the other alkaline earth metals in this group.

To answer these questions about the characteristics of elements in Group 2 (the alkaline earths), we need to refer to their placement on the periodic table and understand their general properties. Group 2 consists of the alkaline earth metals, which include beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).

1. How do they react with iodine?
To determine how the alkaline earth metals react with iodine, we know that the reactivity of metals generally increases as we go down a group on the periodic table. Therefore, the reactivity of the alkaline earth metals with iodine will also increase as we move down the group. Beryllium, being at the top of the group, will react the least vigorously with iodine, while radium, at the bottom, will react the most vigorously.

2. How do they react with water?
Alkaline earth metals react with water, but their reactivity varies within the group. Beryllium does not react with water at all. Magnesium reacts slowly with cold water but reacts more vigorously with steam to produce magnesium oxide (MgO) and hydrogen gas (H2). Calcium, strontium, barium, and radium become more reactive with water as you move down the group. They react quite vigorously, producing the corresponding metal hydroxide and hydrogen gas.

3. How do they react with oxygen?
Alkaline earth metals readily react with oxygen to form metal oxides. The reactivity with oxygen increases as we move down the group. Beryllium does not react with oxygen, while magnesium reacts slowly at high temperatures to form magnesium oxide (MgO). Calcium, strontium, barium, and radium react more vigorously with oxygen as you move down the group, forming the corresponding metal oxides.

4. Which reacts the most vigorously?
Based on the information above, radium, as the last element in the group, will react the most vigorously with iodine, water, and oxygen due to its higher reactivity compared to the other alkaline earth metals.

5. Which element in the group is the most metallic in character?
The metallic character generally increases as we move down a group on the periodic table. Therefore, radium, being at the bottom of Group 2, will have the highest metallic character among the elements in the alkaline earths.