Answer:
The correct answer is A
Explanation:
Hydrogen, oxygen, chlorine are the most abundant elements in oceans.
Oxygen is 85.84% by mass
Hydrogen is 10.82% by mass
Chlorine is 1.94% by mass
The sodium metal is the most reactive element in the periodic table.
<h3 /><h3>What is alkali metals?</h3>
Alkali metals are metals found in the group of 1 of the periodic table.
Examples of metals found in group 1 in decreasing order of reactivity;
The most reactive element in periodic table is found in the group 1 of the periodic table and this element is sodium.
Thus, sodium metal is the most reactive element in the periodic table.
Learn more about reactivity of elements here: brainly.com/question/2029679
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