13. Hydrogen and helium have both been used to fill balloons. Which property of helium

makes it the preferred choice to hydrogen?

Why does a ballon fly around when you let the air out of it

What is the purpose of a flame test?

8. Which of the given atoms has the smallest atomic radius? Provide an explanation a. Bi b. P C. N d. As

Less dense then gas

What is sometimes described as the ability to do work?

A covalent bond in which electrons are shared unequally

Transferring or sharing electrons between atoms forms

The most common element in the atmosphere are

What Is the name of the force that holds together the sub Tomic particles of the nuclear?

Henry Moseley used X-ray experiments to determine the atomic number of elements. How did his discovery contribute to the development of the periodic table? A. It confirmed that elements should be arranged in strict order of increasing atomic mass. B.