2. Atoms & Elements

Which metalloid is commonly used in solar cells and computer chips?

Which element on the periodic table has 4 energy levels and 8 valence electrons?

Where are the transition metals located on the periodic table?

Which of the following elements is a transition metal in period 4 of the periodic table?

Which two elements are the most abundant in Earth's crust?

Which two elements make up the greatest percentages by mass in Earth's crust?

Which element in period 3 of the periodic table is known to be a highly reactive metal?

How many elements are present in period 4 of the periodic table?