Virtual Classifying Elements on the Period Name the three general categories into which the elements are divided. 3

Metals, Non-Metals and Metalloids.

Note:

There are in fact four main categories:
Metals, nonmetals, metalloids and noble gases. However, noble gases are consist of elements of no toxicological chemical significance because they are very stable and not forming any stable compound and interactive.

2positives of biotechnology: 1. plants have become more resistant to viruses and other communicable pests.2. with the of biotechnology, we have been able to produce better tasting fruits as well as vegetables.2 negatives of biotechnology: 1. biotechnology poses a number of environmental threats. genetically modifies crops often infect monarch butterflies and other insect species.2. viruses could combine with crops.