Atomic Structure & Chemical Bonding Basics

An element's atomic number indicates the number of protons it has in its nucleus. In this case, the element with an atomic number of 11 has 11 protons. The mass number, which is the sum of protons and neutrons, is 23, but it does not affect the count of protons directly. Therefore, the number of protons remains 11.

To determine the number of neutrons in an element, subtract the atomic number from the mass number. The atomic number (11) represents the number of protons, while the mass number (23) is the total number of protons and neutrons. Therefore, the calculation is: 23 (mass number) - 11 (atomic number) = 12 neutrons. This shows that the element has 12 neutrons in its nucleus.

Sodium has an atomic number of 11, which means it has 11 electrons. According to the 2, 8, 1 rule, the first energy level can hold 2 electrons, the second can hold 8, and the third can hold up to 8 as well. For sodium, the first level is filled with 2 electrons, the second level with 8 electrons, and the remaining 1 electron goes into the third level. This results in the electron configuration of 2, 8, 1, indicating that sodium has one electron in its outermost shell, making it a highly reactive element.

In a neutral atom, the overall charge is zero, which means that the positive charges from protons must balance the negative charges from electrons. Since protons are located in the nucleus and carry a positive charge, each proton is neutralized by an electron. Therefore, for an atom to remain neutral, the number of electrons must equal the number of protons. This balance is fundamental to the structure of atoms and dictates their chemical properties.

Ionic bonding occurs when electrons are completely transferred from a metal atom to a non-metal atom. This transfer results in the formation of positively charged metal ions and negatively charged non-metal ions. The electrostatic attraction between these oppositely charged ions creates a strong bond, resulting in the formation of ionic compounds. This type of bonding typically occurs between elements that have significantly different electronegativities, allowing metals to lose electrons easily while non-metals gain them to achieve stable electron configurations.

Valence electrons are the outermost electrons in an atom and play a crucial role in chemical bonding. The number of these electrons determines how an atom can bond with others, influencing its ability to gain, lose, or share electrons. This behavior defines the atom's valency, which is the measure of its combining capacity with other atoms. Therefore, understanding the number of valence electrons is essential for predicting how an element will interact chemically, making the statement true.

Sodium chloride is the proper name for the ionic compound NaCl, consisting of sodium ions (Na⁺) and chloride ions (Cl⁻). In ionic compounds, the name typically reflects the cation (positive ion) followed by the anion (negative ion). Here, sodium is the cation derived from sodium metal, and chloride is the anion derived from chlorine gas. This compound is commonly known as table salt and is essential in various biological and chemical processes. Other options listed do not accurately represent the composition of NaCl.