What correlation, if any, exists for the Period 2 elements be-tween group number and the number of covalent bonds the ele-ment typically forms? How is the correlation different for elements in Periods 3 to 6?

19 of 44 > © Macmillan Learning In the given three-dimensional molecular structure, the differently colored spheres represent different types of atoms. Write a molecular formula for this molecule. molecular formula: 4 R % 67 68 5 1 SPECIAL xº (g) ΔΣΩ λμπ X₁ X () 6 [] (s) Y (1) (aq) →>>> MacBook Pro The 11 7 U t CLR 8 K →>> 9 Rotate X You 9 Rotate Y ( 0 ☐C □H D Rotate Z 0 Zoom In P O Zoom Out Attempt A Label Atoms C

Write down the “general” chemical formula for the garnet group, and then give the specific names andchemical formulas for the pyralspite and ugrandite garnets (3 per group).

BOTH PLEASE Consider an ionic compound, MX,, composed of generic metal M and generic gaseous halogen X. • The enthalpy of formation of MX, is AH; = -739 kJ/mol. • The enthalpy of sublimation of M is AHub = 131 kJ/mol. • The first, second, and third ionization energies of M are IE, = 635 k/mol, IE, = 1575 kl/mol, and IE, = 2629 kJ/mol. • The electron affinity of X is AHEA = -327 kJ/mol. (Refer to the hint). • The bond energy of X, is BE = 229 kJ/mol. Determine the lattice energy of MX,. ΔΗ kJ/mol TOOLS x10 Consider the following information. • The enthalpy of formation of BaO is AH; = -548.0 kJ/mol. • The enthalpy of sublimation of Ba is AH ub = 180.0 kJ/mol. • The first and second ionization energies of Ba are IE, = 503 kJ/mol and IE, = 965 kJ/mol. • The first electron affinity of O is AHEAI = -142 kJ/mol. • The bond energy of O, is BE = 498 kJ/mol. • The lattice energy of BaO is AHice = -3029 kJ/mol. Determine the second electron affinity of O. AHEAZ= kl/mol

[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

List the order in which the orbitals are filled as the atoms beyond hydrogen are built up. How many electrons overall can be accommodated in the first and second principal energy levels? How many electrons can be placed in a given s subshell? In a given p subshell? In a specific p orbital? Why do we assign unpaired electrons in the 2p orbitals of carbon, nitrogen, and oxygen?

For each of the following atoms or ions, state the total number of electrons, the number of valence electrons, and the number of core electrons. (a) Rn (b) Sr+ (c) Se2 (d) Sb2

Before the element scandium was discovered in 1879, it was known as “eka-boron.” Predict the properties of scandium from averages of the corresponding properties of its neighboring elements in the periodic table. Compare your predictions with the observed values in Appendix F.

Why do most monatomic cations of the main-group elements have a charge equal to the group number? Why do most monatomic anions of these elements have a charge equal to the group number minus eight?

What are the representative elements? In what region(s) of the periodic table are these elements found? In what general area of the periodic table are the metallic elements found? In what general area of the table are the nonmetals found? When in the table are the metalloids located?