Question

1. choose the best answer. which element does the chart describe? it is the lightest element in existence. in its purest form, it is found as a gas. it is reactive, or easily joined with other elements to create new material. it is the most common element in the universe. it is the simplest element. it is what causes the sun and stars to continue burning brightly. it is a very powerful and flammable material and can easily explode. hydrogen helium sodium oxygen

Explanation:

Hydrogen is the lightest, simplest, and most common element in the universe. It is a gas in its pure form, reactive, and involved in stellar - burning processes. Helium is not reactive like hydrogen. Sodium is a solid metal under standard conditions and not the lightest. Oxygen is also not the lightest or simplest element.

Answer:

A. hydrogen