Question

summarizing reactivity trends on the periodic table

use the drop-down menus to complete each sentence

elements in the same have the same number of valence electrons

elements in the same have the same number of electron shells

metallic elements become reactive as you move left to right in a period

metallic elements become reactive as you move top to bottom in a group

Explanation:

Identify valence electron trends

Elements in the same vertical column, known as a group, share similar chemical properties because they have the same number of valence electrons in their outermost shell.

Identify electron shell trends

Elements in the same horizontal row, known as a period, have their outermost electrons in the same principal energy level, meaning they have the same number of electron shells.

Analyze metallic reactivity across a period

As you move from left to right across a period, the nuclear charge increases, pulling electrons closer and making it harder for metallic elements to lose electrons. Therefore, metallic elements become less reactive as you move left to right in a period.

Analyze metallic reactivity down a group

As you move from top to bottom down a group, the number of electron shells increases, which increases the atomic radius and shields the valence electrons from the nucleus. This makes it easier for metals to lose electrons, meaning metallic elements become more reactive as you move top to bottom in a group.

Answer:

Use the drop-down menus to complete each sentence

Elements in the same <blank>group</blank> have the same number of valence electrons

Elements in the same <blank>period</blank> have the same number of electron shells

Metallic elements become <blank>less</blank> reactive as you move left to right in a period

Metallic elements become <blank>more</blank> reactive as you move top to bottom in a group