Use the periodic table below and what you learned about the mystery element on the previous pages to answer the following questions.
1. Which element has 39 protons?
A. oxygen (O)
B. yttrium (Y)
C. carbon (C)
D. neptunium (Np)
2. Which element’s atomic number is closest to its atomic mass?
A. hassium (Hs)
B. holmium (Ho)
C. hafnium (Hf)
D. hydrogen (H)
3. Which element is in the same period as aluminum (Al)?
A. boron (B)
B. indium (In)
C. magnesium (Mg)
D. actinium (Ac)
4. Which of these elements is in the same group, or column, as helium (He)?
A. hydrogen (H)
B. krypton (Kr)
C. cadmium (Cd)
D. plutonium (Pu)
5. Which of these elements is an inner transition metal?
A. bohrium (Bh)
B. strontium (Sr)
C. einsteinium (Es)
D. tin (Sn)