I Review | Constants | Periodic Table An electron-dot symbol consists of the symbol for an element surrounded by dots. The number of dots indicates the number of valence electrons in an atom of that element. Dots are placed on four sides of the symbol (top, bottom, left, and right) with a maximum of two per side. Also keep in mind that the electrons should be as spread out as possible. For example, correct and incorrect ways of writing the electron-dot symbols for oxygen are shown here Part A Add single electrons and/or electron pairs as needed to complete the electron-dot symbol for astatine, At. To return the atom to its original state, use the reset button. Click to select an electron-pair or single electron, then click on the element symbol to add electrons. Click the reset button to clear all electrons and start over. Correct Incorrect • View Available Hint(s) In the correct electron-dot symbol, the electrons are distributed across all sides. At

Only typed solution.

When sodium reacts with chlorine to form an ionic compound, each metal atom loses _____ electron(s) and each nonmetal atom gains _____  electron(s).   There must be ___(1,2,3) sodium atom(s) for every ___ (1,2,3) chlorine atom(s) in the reaction.

[Review Topics] [References] Use the References to access important values if needed for this question. The following Lewis diagram represents the valence electron configuration of a main-group element. This element is in group According to the octet rule, this element would be expected to form a(n) If X is in period 2, the ion formed has the same electron configuration as the noble gas The symbol for the ion is Submit Answer Retry Entire Group 9 more group attempts remaining with a charge of Previous Next K

A monatomic ion with a charge of -2 has an electronic configuration of 1s22s22p63s23p64s23d104p65s24d105p6.This ion is a(n) _______cation anion.What is the chemical symbol of the noble gas this ion is isoelectronic with? Xe.What is the formula of the ion? Ba2+.

Which of the following answer choices explains how Lewis-Dot structures are used in Chemistry? O Lewis-Dot Structures are used to illustrate the valence electrons of an atom. Valence electrons are represented as dots around the element symbol of the atom. O Lewis-Dot Structures are used to illustrate the core electrons of an atom. Core electrons are represented as dots around the element symbol of the atom. O Lewis-Dot Structures are used to illustrate the protons of an atom. Protons are represented as dots around the element symbol of the atom. O Lewis-Dot Structures are used to illustrate the neutrons of an isotope. Neutrons are represented as dots around the element symbol of the atom.

Determine the number of valence electrons for each of the following atoms. Enter each answer as a numeral. For example, if an atom has two valence electrons, enter the numeral 2. а) Вe b) Al с) О d) Ar