Atomic number (Z) = Number of protons. This defines the element. Mass number (A) = Number of protons + Number of neutrons. The symbol of an element is written as $ ^A_Z \text{X} $, where X is the chemical symbol of the element, A is the mass number, and Z is the atomic number.
An atom consists of 17 protons and 18 neutrons. What is the correct symbol for this element? (1) $ \frac{35}{17} \text{Cl} $ (2) $ \frac{40}{18} \text{Ar} $ (3) $ \frac{80}{35} \text{Br} $ (4) None of the above (5) Question not attempted
Asked in Department Recruitment 2024 (Chemist) 2024 · Topic: Atomic Structure (Isotopes, Isobars, and Isotones)
More Chemistry questions
- The number of electrons, protons and neutrons in a species are equal to 23, 26 and 26 respectively. The proper symbol of the species is - (1) Fe3+ (2) Fe2+ (3) Fe3+ (4) Fe2+ (5) Question not attempted
- Which one of the following elements has atomicity equal to one? - Sulphur - Argon - Chlorine - Oxygen
- Isotopes of an element have
- An element has an atomic number of 16. What is the principal quantum number (n) of its outermost electrons ?
- 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:
