Question

9/19/25 and 9/22/25
answer in complete sentences or complete thought

1. how many rows are on the periodic table?
2. how many columns are on the periodic table?
3. how is the periodic table arranged?
4. what is the maximum number of electrons allowed in each orbital?
5. what three rules govern electron configuration?

Explanation:

1. The periodic table has 7 rows, called periods.
2. It has 18 columns, called groups.
3. It is arranged by increasing atomic number, with elements having similar chemical properties placed in the same group.
4. Each orbital can hold a maximum of 2 electrons.
5. The three rules governing electron - configuration are the Aufbau principle (electrons fill the lowest - energy orbitals first), the Pauli exclusion principle (no two electrons in an atom can have the same set of four quantum numbers), and Hund's rule (electrons occupy degenerate orbitals singly before pairing up).

Answer:

1. There are 7 rows on the periodic table.
2. There are 18 columns on the periodic table.
3. The periodic table is arranged by increasing atomic number.
4. The maximum number of electrons allowed in each orbital is 2.
5. The three rules that govern electron configuration are the Aufbau principle, the Pauli exclusion principle, and Hund's rule.