Groups of the periodic table correspond to elements with:
a. the same color
b. the same atomic number
c. similar chemical properties
d. similar numbers of nuetrons

Answer;

C. Similar chemical properties

Explanation;

-The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties. The horizontal rows on the periodic table are called periods.

-For example; all of the 1A elements have one valence electron. This is what causes these elements to react in the same ways as the other members of the family. They are all very reactive and form compounds in the same ratios with similar properties with other elements. Because of their similarities in their chemical properties, these elements are in  the same group. These elements are called alkali metals.

answer: good job it's all correct !

explanation:

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27