Which element is the lightest noble gas?

What is the atomic number of carbon?

. Which element has the highest atomic number among the first 20?

Hydrogen is the most abundant element in the universe. True or false?

What is the chemical symbol for sodium?

Which element is commonly used in fluorescent lights and has the atomic number 10?

What is the chemical symbol for potassium?

What is the heaviest naturally occuring element in the periodic table?

Which element is a key component in the Earth's atmosphere?

What is the most common element in space?

Which element is used as a coolant in nuclear reactors?

What element is mostly found in stars?

Which elements are found in the core of the Earth?

Electron Arangement of calcium