Question

1. groups of the periodic table corresponds to elements with:

a. the same color
b. same atomic number
c. similar chemical properties
d. similar numbers of neutrons

Explanation:

• Option a: The color of elements in a group of the periodic table is not a defining characteristic for grouping; different elements in a group can have different physical appearances including color, so this is incorrect.
• Option b: Atomic number is unique to each element (it defines the element), so elements in a group have different atomic numbers (they are different elements), so this is incorrect.
• Option c: Elements in the same group of the periodic table have the same number of valence electrons, which leads to similar chemical properties (e.g., alkali metals in Group 1 all are reactive metals, halogens in Group 17 are reactive non - metals). This is the correct characteristic of elements in a group.
• Option d: The number of neutrons can vary (isotopes) and is not a basis for grouping in the periodic table. Elements in a group can have different numbers of neutrons, so this is incorrect.

Answer:

c. Similar chemical properties