Energy Levels & Electron Configuration

The video tutorial explains the structure of an atom, focusing on protons, neutrons, and electrons. It details how electrons are arranged in shells around the nucleus, with specific examples of lithium, carbon, and magnesium. The tutorial also covers how electron configurations determine an element's reactivity and its group on the periodic table.

What is the relationship between protons and electrons in a neutral atom?

• The number of protons is double the number of electrons.

• The number of protons is half the number of electrons.

• The number of electrons is equal to the number of protons.

• The number of electrons is unrelated to the number of protons.

How many electrons can the first shell of an atom hold?

• Six electrons

• Two electrons

• Eight electrons

• Four electrons

What is the electronic configuration of Lithium?

• Li, 2, 2

• Li, 1, 2

• Li, 2, 1

• Li, 3, 0

Which element has the electronic configuration of 2, 8, 2?

• Oxygen

• Lithium

• Magnesium

• Carbon

What determines the group number of an element on the periodic table?

• The total number of electrons

• The number of neutrons in the nucleus

• The number of protons in the nucleus

• The number of electrons in the outer shell