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1. Lithium and sodium have similar chemical properties. For example, both can form ionic bonds with chloride. Which of the following best explains this similarity?
2. Carbon and silicon are the basis of biological life and synthetic computing, respectively. While these elements share many chemical properties, which of the following best describes a difference between the two elements?
3. What determines the length of an element's atomic radius?
I. The number of valence electrons
II. The number of electron shells
III. The number of neutrons in the nucleus
4. Ionization energy contributes to an atom's chemical reactivity. Which of the following shows an accurate ranking of ionization energies from lowest to highest?
5. Antimony is used in some antiparasitic medications—specifically those targeting Leishmania donovani. What type of element is antimony?
6. The properties of atoms can be predicted, to some extent, by their location within the Periodic Table. Which property or properties increase in the direction of the arrows shown?
II. Atomic radius
III. First ionization energy
7. Metals are often used for making wires that conduct electricity. Which of the following properties of metals explains why?
8. Which of the following is an important property of the group of elements shaded in the Periodic Table below?
9. When dissolved in water, which of the following ions is most likely to form a complex ion with H2O?
10. How many valence electrons are present in elements in the third period?
11. Which of the following elements has the highest electronegativity?
12. Of the four atoms depicted here, which has the highest electron affinity?
13. Which of the following atoms or ions has the largest effective nuclear charge?
14. Why do halogens often form ionic bonds with alkaline earth metals?
15. What is the highest-energy orbital of elements with electrons in the n = 3 shell?
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