Answer:
Answer 1: 8
Answer 2: Protons and Valence Electrons
Answer 3: Hydrogen
Answer 4: When atoms have fewer than eight electrons, they tend to react and form more stable compounds.
Step-by-step explanation:
.Atoms lose, gain, or share electrons to have a full valence shell of eight electrons. Hydrogen although is an exeption exception because it can hold a maximum of two electrons in its valence level. They may react and form more stable compounds.