If atomic number of an element is 11, the correct name, symbol and valency are:

The correct answer is Sodium, Na, 1.

Key Points

• The element with atomic number 11 is Sodium (Na), as per the periodic table.
• Sodium is an alkali metal and belongs to Group 1 in the periodic table.
• Sodium has a valency of 1 because it loses one electron to form a stable Na⁺ ion.
• The symbol for Sodium is Na, derived from its Latin name "Natrium."
• It is highly reactive and is commonly found in nature as compounds like sodium chloride (table salt).

Additional Information

• Atomic Number:
  • The atomic number of an element represents the number of protons in its nucleus.
  • For Sodium (Na), the atomic number is 11, meaning it has 11 protons and 11 electrons in its neutral state.
• Electron Configuration of Sodium:
  • The electronic configuration of Sodium is 1s² 2s² 2p⁶ 3s¹.
  • The single electron in the outermost shell (3s) is responsible for its valency of 1.
• Sodium's Reactivity:
  • Sodium is a highly reactive metal, reacting vigorously with water to form sodium hydroxide and hydrogen gas.
  • To prevent unwanted reactions, Sodium is stored in inert substances like oil.
• Role in Biological Systems:
  • Sodium ions (Na⁺) play a crucial role in maintaining fluid balance and nerve signal transmission in the human body.
  • Excess or deficiency of sodium in the body can lead to health issues such as hypernatremia or hyponatremia.
• Common Compounds of Sodium:
  • Sodium forms various compounds like sodium chloride (NaCl), sodium bicarbonate (baking soda), and sodium hydroxide (caustic soda).
  • Sodium chloride is essential for human consumption and is used as a preservative and flavor enhancer in food.