2. Atoms & Elements

Which of the following elements has an atomic number of 10?

Approximately how many elements are currently represented on the periodic table?

Which of the following is the atomic number of copper (Cu) on the periodic table?

Which of the following elements is necessary for the production of thyroid hormone?

What is the symbol for the element with 3 protons?

The arrow is pointing to sodium's symbol on the periodic table. Which of the following is the correct chemical symbol for sodium?

According to what property did Dmitri Mendeleev arrange the elements in his original periodic table?

Which of the following is the chemical symbol for an element?

Which element has the chemical symbol 'Ag'?

On the periodic table, gold has the atomic number 79. This means that:

Which element has the symbol At?

In noble gas notation, the symbol Xe is used to represent the electron configuration of which element as its core?

Which element on the periodic table has 25 protons?

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

Which statement accurately describes the chemical symbol of an element?