The element with the most pronounced oxidizing properties: 1. nitrogen; 2. phosphorus; 3. arsenic; 4. antimony;

Group – a sequence of atoms of chemical elements, which are arranged in increasing order of their nuclear charge, and atoms of one group have the same electronic structure.

The physical meaning of the group number is the number of valence electrons at the external energy level.

In total, 18 groups are displayed in the periodic table (extended version), they are subdivided into subgroups (A, B).

In groups from top to bottom, metallic properties (basic properties) are enhanced, and non-metallic (acidic properties) are weakened, due to an increase in electronic levels and a decrease in the attraction of electrons on the outer layer by the nucleus.