Which of the following os a true statement about the periodic table?
A. periods form horizonal rows;groups form vertical columns
B. groups form horizontal rows;periods form vertical columns
C. catagories form horizontal rows;gases form vertical columns
D. gases form horizontal rows; catagories form vertical columns
A is a true statement.
B is not a true statement.
Periods form rows; groups form columns.
What is periodicity
To determine the correct statement about the periodic table, let's break down the options and understand the different terms involved.
A. periods form horizontal rows; groups form vertical columns
B. groups form horizontal rows; periods form vertical columns
C. categories form horizontal rows; gases form vertical columns
D. gases form horizontal rows; categories form vertical columns
The periodic table is an organized arrangement of chemical elements based on their atomic number, electron configuration, and recurring chemical properties.
1. Periods: Periods in the periodic table refer to the horizontal rows. There are seven periods in total, labeled from 1 to 7.
2. Groups: Groups, also known as families, refer to the vertical columns. There are 18 groups in total, labeled from 1 to 18.
3. Categories: In the periodic table, different categories or classifications of elements can be identified based on their properties. These categories include metals, nonmetals, and metalloids, among others.
Now, let's analyze the options:
A. periods form horizontal rows; groups form vertical columns
This option correctly describes the arrangement of periods (horizontal rows) and groups (vertical columns) in the periodic table.
B. groups form horizontal rows; periods form vertical columns
This option incorrectly switches the terms. Groups are actually the vertical columns, not horizontal rows, and periods refer to the horizontal rows.
C. categories form horizontal rows; gases form vertical columns
This option introduces a new term, categories, which is not part of the traditional periodic table organization. Additionally, gases are not specifically assigned to vertical columns.
D. gases form horizontal rows; categories form vertical columns
This option also introduces a new term, categories, and incorrectly suggests that gases form horizontal rows in the periodic table.
Therefore, the correct statement is:
A. periods form horizontal rows; groups form vertical columns.