2. Atoms & Elements

Which element on the periodic table has 13 protons?

Which noble-gas symbol is used in the noble-gas electron configuration for tin (Sn)?

Why is water (H_2O) not listed as an element on the periodic table?

Which of the following is the correct chemical symbol for copper?

Which of the following is the correct chemical symbol for the element tin?

Which elements are represented by the symbols S and Na on the periodic table?

Which of the following element symbols represents potassium on the periodic table?

Atoms of which element contain 25 protons?

Which of the following is the correct chemical symbol for carbon?

On many periodic tables, the neon green color is used to indicate which type of element?

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?

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

Which noble gas is located in period 3 of the periodic table?

Which of the following is the chemical symbol for sodium?

Which of the following elements has a two-letter symbol on the periodic table?