Question

1 the period number of an element indicate the number of electron energy levels number of protons number of valence electron number of neutrons 2 which particle in an atom has a negative charge? proton electron none of the above neutron

Explanation:

1. In the periodic table, the period number of an element corresponds to the number of electron - energy levels. For example, hydrogen is in period 1 and has 1 electron - energy level.
2. Protons have a positive charge, neutrons have no charge, and electrons have a negative charge. This is a fundamental property of sub - atomic particles.

Answer:

1. number of electron energy levels
2. Electron