Exploring Atomic Numbers and Metallic Character in the Periodic Table

The video explains the structure of the periodic table, where elements are arranged by increasing atomic number. Elements with similar electronic configurations are grouped in columns. The periodic table shows recurring trends in properties across rows and columns. Metallic character increases down a column and from right to left, while non-metallic character increases from left to right and upward. Alkali metals are the most metallic, and halogens are the most non-metallic, with fluorine being the most active non-metallic element.

How are elements arranged in the periodic table?

• By alphabetical order

• By decreasing atomic number

• By increasing atomic number

• By increasing atomic mass

What do the columns in the periodic table represent?

• Periods

• Groups

• Blocks

• Rows

Which row of the periodic table do sodium through argon belong to?

• Second row

• Third row

• First row

• Fourth row

How many known elements are there currently?

• 118

• 100

• 120

• 112

What happens to the metallic character of elements as you move down a column?

• It decreases

• It fluctuates

• It increases

• It remains the same

Which group contains the most metallic elements?

• Group 3

• Group 2

• Group 1

• Group 4

Which element is the most active nonmetal?

• Nitrogen

• Fluorine

• Oxygen

• Chlorine