Answer all the questions below then hit the check answer button and scroll down to get your score.
1. Which statement best defines the atomic radius?
2. What is the general trend in atomic radius across a period (left to right)?
3. Which statement best explains why atomic radius increases down a group?
4. Across a period, atomic radius because nuclear charge increases while shielding is similar.
5. Which technique is commonly used to determine internuclear distances in crystals?
6. The covalent radius is of the bond length; bond length in molecules can be measured using spectroscopy.
7. Which unit is most commonly used for atomic radius in data tables?
8. Across Period 3, the effective nuclear charge on the outer electrons generally , pulling them closer to the nucleus.
9. What happens to atomic radius down Group 1?
10. If shielding stayed similar but nuclear charge increased substantially across a period, atomic radius would most likely:
11. Which statement is correct?
12. Down a group, increased shielding makes outer electrons less to the nucleus; between Na (166 pm) and K (203 pm) the increase is roughly pm.
13. Which term refers to the net positive charge experienced by a valence electron?
14. Across a period (main-group), additional electrons are added to the:
15. In metals, the radius commonly quoted is the radius (half the distance between neighbouring nuclei in the lattice).
