Question

Part 1. Matching

Place the letter for the correct element category from the list below next to each description.
Part 2. Fill in the blank
Write the word or phrase that best completes each sentence. Choose from the following:
group, period, atomic number, periodic, metal, metalloid, nonmetal, chlorine, magnesium.
1. The elements on the periodic table are arranged in order of increasing _____________________.
2. The arrangement of the elements on the periodic table shows a predictable, repeating, ____________
pattern that allows us to predict chemical properties.
3. The elements Na, Mg, and Cu are each classified as ___________________ elements.
4. When elements are located in the same ______ they exhibit similar chemical and physical properties.
5. The element ________ is an example of an element that is classified as a nonmetal.
Part 3. Classifying
For each electron configuration identify the element and decide which group the element belongs to on the
periodic table. (Hint: Find the total number of electrons for each and refer to page 186 in your Student
Book to determine the element and group number.
Electron configuration Element Group number
1. 1s2
2s22p6.
2. 1s2
2s22p6
3s2.
3. 1s2
2s2
2p6
3s2
3p6
.
4. 1s2
2s2
2p6
3s2
3p6
4s2
.
5. 1s2
2s22p6
3s23p3.
A NATURAL APPROACH TO CHEMISTRY
_______
_______
_______
_______
_______ _______
_______
_______
_______
_______
1. ___ The element sodium (Na) belongs to this group of elements.
2. ___ These elements are not likely to chemically bond with other elements.
3. ___ These elements are located in the center of the periodic table.
4. ___ These elements tend to gain one electron to fill their outer shell and are sometimes colored gases.
5. ___ These elements have two electrons in their highest unfilled energy level.

Answer 1

The periodic table organizes elements in increasing order of atomic number. Elements in the same group have similar properties, and the group and period arrangement helps predict an element's properties. The answers provided include the correct classification and group number for various elements according to their electron configurations.

Step-by-step explanation:

The periodic table is a tool used to group elements based on their chemical properties. The elements in the periodic table are arranged in rows called periods and columns known as groups, based on increasing atomic number.

Here are the answers to your questions:

1. The elements on the periodic table are arranged in order of increasing atomic number.
2. The arrangement of the elements on the periodic table shows a predictable, repeating, periodic pattern that allows us to predict chemical properties.
3. The elements Na, Mg, and Cu are each classified as metal elements.
4. When elements are located in the same group they exhibit similar chemical and physical properties.
5. The element chlorine is an example of an element that is classified as a nonmetal.

Classifying

• Element: Helium (He), Group number: 18 (Noble Gases)
• Element: Neon (Ne), Group number: 18 (Noble Gases)
• Element: Argon (Ar), Group number: 18 (Noble Gases)
• Element: Calcium (Ca), Group number: 2 (Alkaline Earth Metals)
• Element: Phosphorus (P), Group number: 15 (Pnictogens)