There is no compound with the formula NaC1.
NaCl (with a lowercase L) contains Sodium and Chlorine.
Yes, gold is a natural element found on Earth.
Aluminum is the element found in a compound called bauxite.
Calcium is the element found in marble, limestone, chalk, and teeth.
One essential element that is not found in the atmosphere is phosphorus. It is an important nutrient for plants and animals, but it is primarily found in rocks and minerals on Earth's surface rather than in the gaseous atmosphere.
Helium is named after the Greek god of the Sun, Helios.