Use the periodic table to answer the question.
Sure! What is the question?
Which statement correctly compares the valence electrons for atoms of francium (Fr) and barium (Ba)?
Fr (Francium) and Ba (Barium) are both located in Group 2 of the periodic table. Group 2 elements are known as alkaline earth metals, and they have two valence electrons. As a result, both francium and barium have 2 valence electrons.
Why are the noble gases the least reactive elements? (1 point) Responses
The noble gases are the least reactive elements because they have a complete outer electron shell. They contain a full complement of valence electrons, which makes them stable and less likely to form chemical bonds with other elements. This stability results in minimal reactivity and a low tendency to gain, lose, or share electrons.
An element has six valence electrons. Which ionic charge will its ion carry?(1 point) Responses
options:
1#2–
2# 6+
3#2+
4# 6–
To determine the ionic charge of an element with six valence electrons, it's essential to refer to the periodic table. Elements typically gain or lose electrons to achieve a stable electron configuration, either by filling or emptying their valence shell.
Since the element in question has six valence electrons, it is likely from Group 16 (Group 6) of the periodic table. Elements in Group 16 tend to gain two electrons to achieve a stable configuration.
Given this information, the correct ionic charge for the ion of this element would be 2-. Therefore, the correct option is #2-.
Why is carbon so useful in molecules for living things?(1 point)
Carbon is exceptionally useful in molecules for living things due to its unique properties and bonding capabilities. These reasons include:
1. Versatile bonding: Carbon has four valence electrons, enabling it to form stable covalent bonds with various other elements and even with other carbon atoms. This versatility allows carbon to create diverse and complex molecular structures, providing the basis for the vast array of organic compounds found in living organisms.
2. Building block of life: Carbon is the primary element involved in constructing the backbone of biological macromolecules, such as proteins, nucleic acids (DNA and RNA), carbohydrates, and lipids. Carbon's ability to form long chains, branched structures, and rings allows for the diverse and intricate molecular architecture necessary for life's processes.
3. Isomerism: Carbon atoms can form isomers, which means they have the same molecular formula but different structural arrangements. This property allows for molecular diversity and functionality, as even slight changes in the arrangement of carbon atoms can lead to significant variations in molecular properties and biological functions.
4. Stability: Carbon-carbon bonds are relatively strong, providing stability to organic compounds. Additionally, carbon compounds are resistant to high temperatures, making them suitable for sustaining biological processes.
5. Reactivity: Despite their stability, carbon compounds can undergo various chemical reactions, enabling dynamic processes within living organisms. Carbon compounds can undergo oxidation, reduction, and other transformations, facilitating energy storage, metabolism, and the synthesis of essential molecules.
Overall, carbon's unique properties, including its bonding versatility, ability to create complex structures, stability, reactivity, and role as a fundamental building block, make it a cornerstone for the chemistry of life.
Why is carbon so useful in molecules for living things?(1 point)
Many molecules in living things have millions of carbon atoms in them.
Carbon is produced in photosynthesis and carries the energy needed for life.
Carbon can form the backbone for millions of compounds found in living things.
Carbon is produced in respiration, making it a readily available element.