Electron Configuration and Valence Electrons

This tutorial explains the relationship between the Bohr model's energy levels and the periodic table rows. It covers how electrons are distributed across different energy levels and how this relates to the periodic table. The video provides practical examples of drawing Bohr model diagrams for elements like magnesium, sulfur, and iron, highlighting the concept of valence electrons and the complexity introduced by transition metals.

What is the primary concept behind the Bohr model in relation to the periodic table?

• Electrons exist in fixed energy levels that correlate with periodic table rows.

• Electrons are randomly distributed around the nucleus.

• Electrons have no specific energy levels.

• Electrons are only found in the first row of the periodic table.

How many electrons can the first energy level hold according to the Bohr model?

• Two electrons

• Four electrons

• Eight electrons

• Ten electrons

In the second row of the periodic table, how many electrons are present?

• Six electrons

• Eight electrons

• Two electrons

• Four electrons

What is a key challenge when filling electrons in the fourth row of the periodic table?

• Ignoring the transition metals

• Adding electrons to the f block

• Skipping the first energy level

• Revisiting the third energy level for transition metals

How many additional electrons need to be added to the third energy level when dealing with transition metals in the fourth row?

• Twenty electrons

• Five electrons

• Ten electrons

• Fifteen electrons

For magnesium, how many valence electrons are present in its outermost shell?

• Three valence electrons

• Two valence electrons

• One valence electron

• Four valence electrons

When drawing the Bohr model for sulfur, how many electrons are in the third energy level?

• Two electrons

• Four electrons

• Eight electrons

• Six electrons

How many protons and electrons does iron have?

• 24 protons and 24 electrons

• 25 protons and 25 electrons

• 26 protons and 26 electrons

• 27 protons and 27 electrons

In the Bohr model, what is the valence electron count for iron?

• One valence electron

• Two valence electrons

• Four valence electrons

• Three valence electrons

What makes the electron configuration of transition metals like iron more complex?

• They require revisiting previous energy levels.

• They only have one energy level.

• They do not follow the periodic table.

• They have fewer electrons than other elements.