Which element has the chemical symbol 'Ag'?

How many elements on the periodic table are known to occur naturally on Earth?

Which statement accurately describes the chemical symbol of an element?

Atoms of which element contain 25 protons?

In the following diagram, the element with atomic number 8 is represented by a question mark. Which element's symbol should replace the question mark?

In the periodic table, the element manganese is represented by a box containing the symbol 'Mn'. If an arrow is pointing to 'Mn', what does this symbol indicate?

Which of the following element symbols represents the element found in mercury?

Which element is in the same period as ruthenium (Ru) but has a higher atomic number than ruthenium?

How many elements are currently recognized on the modern periodic table?