Periodic Table Chemistry Example 4

Follow the full solution, then compare it with the other examples linked below.

Example 4

medium
An element is in Group 17 and Period 3 of the periodic table. What do the group and period tell you about its electrons?

Solution

  1. 1
    For a main-group element, Group 17 means it has 7 valence electrons.
  2. 2
    Period 3 means its electrons occupy 3 shells (energy levels) around the nucleus.

Answer

It has 7 valence electrons and 3 electron shells.
The periodic table is arranged so that groups reveal outer-shell patterns and periods reveal the number of occupied shells. That structure helps predict chemical behavior.

About Periodic Table

A systematic arrangement of all known chemical elements organized by increasing atomic number into rows (periods) and columns (groups), where elements in the same group.

Learn more about Periodic Table →

More Periodic Table Examples

Example 1 easy

Using the periodic table, predict whether silicon (Si) is a metal, nonmetal, or metalloid. Justify y

Example 2 medium

Arrange the following elements in order of increasing atomic radius: [formula], [formula], [formula]

Example 3 easy

Which group of the periodic table contains the noble gases? Why are they chemically inert?

← All Periodic Table Examples Periodic Table Concept