The Correct Answer and Explanation is:
Based on the visual information from the provided image, which shows a worksheet titled “Properties of Elements,” the goal is to identify different sections and groups on a simplified periodic table.
Correct Answer
The pointers on the worksheet correspond to the following terms:
- Hydrogen
- Alkali Metals
- Alkaline Earth Metals
- Transition Metals
- Halogens
- Metalloids
- Noble Gases
- Nonmetals
- Period
- Helium
Explanation
The worksheet in the image is a common educational tool used to teach the organization and properties of elements within the periodic table. Although the text is blurry, the pointers indicate specific, well known regions and groups. The periodic table arranges elements by increasing atomic number and recurring chemical properties.
The vertical columns are called groups, and the horizontal rows are called periods. Pointer 9 indicates a horizontal row, which is known as a period. The elements in a period have the same number of electron shells.
Several key groups are highlighted. Pointer 2 indicates Group 1, the alkali metals. These elements, excluding hydrogen, are highly reactive metals with a single valence electron. Pointer 3 points to Group 2, the alkaline earth metals, which are also reactive and have two valence electrons. Pointer 5 identifies Group 17, the halogens. They are very reactive nonmetals that need one electron to complete their outer shell. Pointer 7 shows Group 18, the noble gases, which are famously unreactive because their outermost electron shells are full.
The table is also divided into blocks and types of elements. Pointer 4 indicates the large central block containing the transition metals, known for their ability to form colorful compounds. The diagonal staircase line, indicated by pointer 6, separates metals from nonmetals. The elements along this line are the metalloids, which have properties intermediate between metals and nonmetals. Pointer 8 shows the general region for nonmetals, located on the upper right side of the table.
Finally, some pointers identify unique, individual elements. Pointer 1 correctly identifies hydrogen, which is in a class of its own despite being in Group 1. Pointer 10 specifies helium, a noble gas that is unique for having only two electrons in its completed outer shell.
