Calcium, magnesium, and strontium are near each other on the periodic table and have some characteristics in common, but they di
2 answers:
<u>Answer:</u> The correct answer is strontium, calcium, magnesium.
<u>Explanation:</u>
Reactivity is defined as the tendency of an atom to loose or gain electrons.
The reactivity of metal decreases as we move from left to right in a period and increases as we move from top to bottom in a group.
The given elements are metals and they belong to group 2 of the periodic table.
Calcium belongs to Period 4 of the periodic table, magnesium belongs to Period 3 of the periodic table and strontium belongs to Period 5 of the periodic table.
Strontium will be more reactive than calcium and it will be more reactive than magnesium.
Order of reactivity of metals follows:
Hence, the correct answer is strontium, calcium, magnesium.
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Answer:
-205.7kj
Explanation:
Now adding reaction 2 and twice of reaction 3 and reverse of reaction 1, we get the enthalpy of the reaction.
The expression for enthalpy for the following reaction will be,
where,
n = number of moles
Now put all the given values in the above expression, we get:
Therefore, the enthalpy of the following reaction is, -205.7kj
The molecular geometry is trigonal bipyramidal.
