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Which is the most reactive metal?
1. Sodium
2. Calcium
3. Iron
4. Potassium

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Correct Answer - Option 4 : Potassium

The correct answer is Potassium.

  • Metals in decreasing order of their reactivity are - Potassium, Sodium, Lithium, Barium, Strontium, and Calcium.

  • Reactivity Series:
    • The reactivity series of metals, also known as the activity series, refers to the arrangement of metals in the descending order of their reactivities.
    • The metals at the top of the reactivity series are powerful reducing agents since they are easily oxidized.
    • These metals tarnish/corrode very easily.
    • The reducing ability of the metals grows weaker while traversing down the series.
    • The electro positivity of the elements also reduces while moving down the reactivity series of metals.
    • All metals that are found above hydrogen in the activity series liberate H2 gas upon reacting with dilute HCl or dilute H2SO4.

  • Sodium:
    • Sodium is a chemical element with the symbol "Na" and the atomic number is 11.
    • It is a soft, silvery-white, highly reactive metal.
    • Sodium is an alkali metal, being in group 1 of the periodic table.
  • Calcium:
    • Calcium is a mineral that is necessary for life. 
    • The symbol of Calcium is "Ca" and its atomic number is 20
    • In addition to building bones and keeping them healthy, calcium enables our blood to clot, our muscles to contract, and our heart to beat.
    • About 99% of the calcium in our bodies is in our bones and teeth.
    • Every day, we lose calcium through our skin, nails, hair, sweat, urine, and feces.
    • Our bodies cannot produce their own calcium.
  • Iron:
    • Iron is a chemical element with the symbol "Fe" and atomic number 26.
    • It is a metal that belongs to the first transition series and group 8 of the periodic table.
    • It is, by mass, the most common element on Earth, right in front of oxygen (32.1% and 30.1%, respectively), forming much of Earth's outer and inner core.
    • It is the fourth most common element in the Earth's crust.
  • Potassium:
    • Potassium is a mineral and an electrolyte.
    • It helps your muscles work, including the muscles that control your heartbeat and breathing.
    • Potassium comes from the food you eat.
    • Your body uses the potassium it needs.
    • The extra potassium that your body does not need is removed from your blood by your kidneys.
    • It has an atomic number 19.

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