I believe it is b. you only want to change one thing at a time so you know which one thing caused the effect
Answer:
Scale is the right answer
Explanation:
The scale is a sentence that relates distance on the map to distance on Earth
21.25 grams would be the answer. I agree
The charge on the ion of an element in a certain group may be determined based on the element's group's position with respect to group 8, or the noble gases. Groups to the right of group 8, groups 1 and 2, have a positive valency. Groups to the left have a negative valency.