Why does the number of elements in successive periods of the peri...

Question

Why does the number of elements in successive periods of the periodic table increase by the progression 2, 8, 18, 32?

Accepted Answer

1. The periodic table is organized based on the electron configuration of atoms. The electron configuration of an atom is determined by the distribution of electrons in its atomic orbitals.. 2. The atomic orbitals are grouped into different energy levels or shells, and each shell is divided into subshells. The first energy level has one subshell (s), the second and third levels have two subshells (s and p), the fourth and fifth levels have three subshells (s, p, and d), and the sixth and seventh levels have four subshells (s, p, d, and f).. 3. The s subshell can hold up to 2 electrons, the p subshell can hold up to 6 electrons, the d subshell can hold up to 10 electrons, and the f subshell can hold up to 14 electrons.. 4. The progression 2, 8, 18, 32 in the number of elements in successive periods of the periodic table corresponds to the maximum number of electrons that can be accommodated in the subshells of each energy level. The first period has one energy level (1s) that can hold 2 electrons. The second period has two energy levels (2s and 2p) that can hold 2 + 6 = 8 electrons. The third period has three energy levels (3s, 3p, and 3d) that can hold 2 + 6 + 10 = 18 electrons. The fourth period has four energy levels (4s, 4p, 4d, and 4f) that can hold 2 + 6 + 10 + 14 = 32 electrons.. 5. Therefore, the number of elements in each period of the periodic table increases by the progression 2, 8, 18, 32 because this reflects the increasing capacity of the atomic orbitals to hold electrons as we move down the periods.

Why does the number of elements in successive periods of the periodic table increase by the progression 2, 8, 18, 32?

비슷한 문제에 대한 검증된 영상 답변:

주요 개념

Electron Shells and Energy Levels

Subshells and Orbital Types

Periodic Trends and Grouping