The Periodic Table
Ptable.com is a great resource for double-checking your understanding of electron configurations and periodic trends, so let’s get some practice using it:
- Go to www.ptable.com and explore the features.
- Select an element and explore each tab for your chosen element.
- Record 5 properties of the element – including the size of the atom and its electronegativity.
- Draw the electron configuration of a neutral atom of that element.
- Find the number of possible isotopes for your element and the number of naturally occurring isotopes. Record the most common isotope in proper form.
- Combine your element with another to create a compound. Write down the third result for the combination of these two atoms.
Electron Configurations and Trends
Answer these discussion questions.
- Given the following part of an electron configuration, 3s2, explain which part refers to the number of electrons, the energy level and the sublevel.
- What is the maximum number of electrons that can occupy a single orbital?
- State and explain Hund’s Rule. Write the electron configuration (orbital notation) for nitrogen using this rule.
- For each of the following electron configurations, name the element:
a) ↑↓1s _↑↓2s __↑↓_ _↑↓__ _↑__2p
b) __↑↓_ 1s __↑↓_2s __↑↓_ __↑↓_ _↑↓_2p _↑↓__3s __↑↓_ __↑↓_ __↑↓_3p _↑↓__4s _↑__ __↑_ __↑_ _↑_ __↑_3d
- Write the electron configurations using noble gas notation for the elements in Group 2 of the periodic table.
- Write the electron configurations for Period 1 elements. What is the relationship between the period number and the energy level of the valence electrons?
- On the Periodic Table below, draw circles to represent the trend in atomic size for:
a) a group
b) a period