Across a period (left to right), the atomic radius decreases because the nuclear charge increases while electrons are added to the same energy shell, pulling the electron cloud closer to the nucleus. Down a group (top to bottom), the atomic radius increases because new electron shells are added, increasing the distance between the nucleus and the valence electrons, despite the increased nuclear charge.
Which one of the following properties decreases across the periodic table from left to right and increases from top to bottom?
Asked in UPSC CAPF 2021 · Topic: Atomic Structure (Isotopes, Isobars, and Isotones)
More Chemistry questions
- The atomic radius of hydrogen atom is
- Which one among the following statements with respect to the atomic number of an atom is correct ?
- Two isotopes have same
- Which radioactive metal is responsible for Chernobyl accident?
- 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
- 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