6. Which of the following pairs would most-likely have similar physical and chemical properties?
a. Lithium and Selenium
b. Vanadium and Radon
C. Sodium and Potassium

What elements have 2 electrons inthe 4s sublevel

Here’s one way to follow the scientific method. place the missing steps in the correct position in the process

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange