Periodic Trends and Metallic Character

The video tutorial explains how to use the periodic table to arrange particles by size, focusing on two sets: oxygen, phosphorus, and sulfur; and sodium, potassium, and sodium ion. It introduces the concept of Z effective, which affects atomic size due to electron shielding. The tutorial also covers the trends of metallic character and electronegativity, highlighting their opposite nature. The instructor emphasizes understanding these concepts without delving into complex calculations, making it accessible for students not in honors classes.

Which element is the largest in size among oxygen, phosphorus, and sulfur?

• They are all the same size

• Sulfur

• Phosphorus

• Oxygen

In the periodic table, which direction indicates an increase in atomic size?

• Up and to the right

• Down and to the right

• Down and to the left

• Up and to the left

Which of the following is the smallest in size?

• Sodium

• Potassium

• Sodium ion

• They are all the same size

What happens to the size of a sodium atom when it loses an electron to become a sodium ion?

• It becomes a different element

• It stays the same

• It becomes smaller

• It becomes larger

What is the effective nuclear charge (Z effective)?

• The atomic mass of an element

• The number of electrons in the outer shell

• The net positive charge experienced by an electron

• The total number of protons in the nucleus

How does electron shielding affect the effective nuclear charge?

• It doubles the effective nuclear charge

• It has no effect

• It decreases the effective nuclear charge

• It increases the effective nuclear charge

Which trend is opposite to metallic character in the periodic table?

• Electron affinity

• Atomic size

• Ionization energy

• Electronegativity

Where are the most metallic elements located on the periodic table?

• Bottom right corner

• Bottom left corner

• Top right corner

• Top left corner

What is the relationship between metallic character and the willingness to give up electrons?

• Metallic character has no relation to electron donation

• Metallic elements always gain electrons

• More metallic elements are more willing to give up electrons

• More metallic elements are less willing to give up electrons

Which of the following statements is true about electronegativity?

• It increases as you move down a group

• It decreases as you move across a period from left to right

• It is the tendency of an atom to attract electrons

• It is the same for all elements