Question

Discuss the trend in modern periodic table for the following properties-
a) Atomic size
b) Chemical reactivity
c) Valance electron
d) nature of oxides

Answer 1

Answer:

1. Moving down a group in the periodic table, the number of filled electron shells increases. In a group, the valence electrons keep the same effective nuclear charge, but now the orbitals are farther from the nucleus. Therefore, the nucleus has less of a pull on the outer electrons and the atomic radii are larger.

Explanation:

1. Elements are arranged in the increasing order of atomic numbers. Elements in the modern periodic table are arranged in 7 periods and 18 groups. Horizontal rows are called periods and vertical columns are called groups. Elements are placed in periods based on the number of shells in their atoms.

2.The significance of atomic numbers in the modern periodic table is that it helps in arranging the elements according to their electronic configuration. Since, the number of valence electrons is the same, elements placed in the same group show similar chemical properties.

3.Electronegativity - The number of protons increases as you go down a column of the periodic table, but the effective nuclear charge doesn't decrease because the number of core electrons also increases. ... As a result, the effective nuclear charge is fairly constant within a column.

4.periodic table trends. 1) As you move down a group, atomic radius increases. WHY? - The number of energy levels increases as you move down a group as the number of electrons increases. ... Therefore, the atomic radius increases as the group and energy levels increase.

5.