Characteristics of a Group or Elements

Is shiny
Is solid at room temperature
Has atoms with two valence electrons

I assume you meant "of" instead of "or". Also I assume you want to identify the group although you never asked a question.

Is shiny. METALS
Is solid at room temperature. METALS
Has atoms with two valence electrons. MUST BE GROUP II; I.E., Be, Mg, Ca, Sr, Ba, Ra.

Ah, you're looking for a group with some sparkle! Well, let me introduce you to the ever-shining and solid group known as the Noble Gases. These elements definitely have that special shine you're looking for. They are shiny because their outermost electron shells are fully filled, making them very stable and non-reactive. And since they have a full complement of valence electrons (two in this case), they are no-nonsense solids at room temperature. So, go ahead and embrace the nobility of these elements – they are the real shiny stars of the periodic table!

The characteristics described belong to a specific group of elements called the alkaline earth metals. The alkaline earth metals possess the following characteristics:

1. Shiny: Alkaline earth metals have a metallic luster, making them appear shiny.

2. Solid at room temperature: Alkaline earth metals are solid at normal room temperatures, unlike some other elements such as mercury, which is a liquid.

3. Two valence electrons: Alkaline earth metals have two valence electrons in their outermost energy level, specifically in the s orbital. This gives them similar chemical properties, including a tendency to lose these two electrons and form a 2+ cation.

Some examples of alkaline earth metals include beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), and barium (Ba).

To determine the characteristics of a group or elements with the given criteria, we can refer to the periodic table. The periodic table organizes elements based on their atomic properties and characteristics.

1. Is shiny: One group of elements that can be shiny are the transition metals. The transition metals are located in the center of the periodic table (groups 3 to 12) and include elements like copper, silver, and gold. They are known for their lustrous and reflective properties.

2. Is solid at room temperature: Almost all elements on the periodic table can exist as solids at room temperature, with some exceptions being gases (e.g., hydrogen, helium) and a few elements that are liquids at room temperature (e.g., mercury, bromine). Therefore, there isn't a specific group of elements that are exclusively solid at room temperature.

3. Has atoms with two valence electrons: Valence electrons are the outermost electrons in an atom that participate in chemical bonding. To identify elements with two valence electrons, we can refer to the periodic table and look at the group number.

Elements in Group 2 of the periodic table (alkaline earth metals) have two valence electrons. This group includes elements such as beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), and barium (Ba).

In summary, based on the given criteria:
- Shiny elements: Transition metals (located in groups 3 to 12).
- Solid at room temperature: Most elements can be solid at room temperature, except for gases and a few liquids.
- Two valence electrons: Elements in Group 2 (alkaline earth metals) have two valence electrons.