24. Which type of bond is formed when electrons are transferred from one atom to another? (1) covalent (2) ionic (3) hydrogen (4) metallic 25. Which Lewis electron-dot structure is drawn correctly for the atom it represents? (1) :N (3) :0: (2) :F: (4) Ne:

The Lewis structure for SF4 is shown. What is the electron-pair geometry around the central atom? :F: :F: Electron Pair Geometry:

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Total valence electron count: Electron group geometry at the central atom: Identity (i.e. atomic symbol) of the fourth period element X: Consult the Table of Covalent Radii of the Elements (https://en.wikipedia.org/wiki/Covalent_radius#Radii_for_multiple_bonds). The estimated X=O bond length (in pm) is:

3) Two new compounds are discovered, compounds GM, by scientists in the VSS jungle. The properties of the newly discovered compound GM, are listed below. Hint: all atoms in this compound obey the octet rule! Compound ER,M, # Valence Electrons G has 4 valence electrons M has 6 valence electrons Electronegativity (EN') values G = 2.1 M = 3.0 a) Complete the table below for compound ER,M,. Compound Lewis Dot Diagram AXE Molecular Polar (P) or Nonpolar (N) Molecule? Formula (VSEPR) Shape name and drawing GM, You are hired as the lead scientist in charge of investigating the compound: GM,. Use your answers from part a) to answer the following questions. b) The molecule has sigma bonds and pi bonds. c) Hybridization name for central atom (G): d) Draw the hybridized energy level diagram for the central atom in the space below.

1.a) What is the effective nuclear charge felt by a valence electron in the element with atomic number 16? b) Arrange the atoms in column 17 in order of decreasing electronegativity.

Starting with 1s2draw out the complete electron configuration for the most stable ion of selenium. Explain how you used the Octet Rule to determine your answer.

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