The principal quantum number (n) of the outermost electrons corresponds to the highest energy level occupied by electrons in the atom's electron configuration. For Sulfur (atomic number 16), the configuration is 1s² 2s² 2p⁶ 3s² 3p⁴, so the outermost electrons are in the n=3 level.
An element has an atomic number of 16. What is the principal quantum number (n) of its outermost electrons ?
Asked in UPSC CISF AC EXE 2020 · Topic: Atomic Structure (Quantum Numbers (Principal, Azimuthal, Magnetic, Spin and their significance))
More Chemistry questions
- The quantum numbers of four electrons are given below – (A) n = 3, l = 0, ml = 0, ms = + 1/2 (B) n = 4, l = 1, ml = 0, ms = – 1/2 (C) n = 4, l = 2, ml = – 2, ms = – 1/2 (D) n = 3, l = 2, ml = 1, ms = – 1/2 Correct order of their increasing energies would be – (1) A < D < B < C (2) D < A < C < B (3) A < B < D < C (4) A < B < C < D (5) Question not attempted
- The total value of magnetic quantum numbers of an electron when the value of n = 4 is - (1) 3 (2) 16 (3) 32 (4) 9 (5) Question not attempted
- What is the correct orbital notation with the following quantum numbers? $ n = 3, l = 2, m_l = +1 $ (1) 3d (2) 3s (3) 2p (4) 3p (5) Question not attempted
- Tincture of iodine is:
- Group of orbitals having identical values of (n + 1) is - - (5) Question not attempted
- 32 g of methane (molar mass 16 g/mol) is mixed with 192 g of oxygen (molar mass 32 g/ mol). Presuming that these gases donot react with each other, what is the mole fraction of methane ?
- The maximum number of molecules are present in _______. [H = 1, C = 12, O = 16, I = 127]
- 180 g of acetic acid (CH₃COOH) is mixed with 180 g of water (H₂O). The mole fraction of acetic acid in the resultant solution is [H = 1, C = 12, O = 16]