Question
Download Solution PDFThe mass number of potassium is ______________.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is 39.
Key Points
- We know that mass no. is given as,
- Mass no.= No. of protons + No. of neutrons.
- Potassium has an atomic number of 19, and an element's atomic number is determined by how many protons it contains.
- Hence, potassium contains 19 protons.
- Twenty neutrons make up potassium.
- The mass number of potassium is calculated using the formula above as,
- Mass no. = 20+19=39.
Additional Information
- Potassium is a member of the alkali group of the periodic table.
- Symbol: K.
- Atomic number: 19.
- Belongs to group 1 in the periodic table.
- First isolated in 1807 by Humphry Davy.
- Sodium and Potassium are the elements known as soft metals(can cut with a knife with little force).
- Potassium metal is kept in kerosene due to its high reactivity with water.
- Potassium bicarbonate is the chemical used in fire extinguishers.
- Potassium is the most common radioisotope in the human body.
- Potassium is the second least dense metal after lithium.
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