Question

Answer true or false.

1. Atoms that lose electrons to achieve a filled valence shell become cations and form ionic bonds with anions.

2. Ionic bonds tend to form between elements on the left side of the Periodic Table, and covalent bonds tend to form between elements on the right side of the Periodic Table.

3. Electronegativity is a measure of an atom's attraction for the electrons it shares in a chemical bond with another atom.

4. Fluorine, in the upper-right corner of the Periodic Table, is the most electronegative element; hydrogen, in the upper-left corner, is the least electronegative element.

5. Electronegativity generally increases from left to right across a period of the Periodic Table.

6. An ionic bond between two atoms forms by the transfer of one or more valence electrons from the atom of lower electronegativity to the atom of higher electronegativity.

7. In forming NaCl from sodium and chlorine atoms, one electron is transferred from the valence shell of sodium to the valence shell of chlorine.

8. A covalent bond is formed between two atoms whose difference in electronegativity is less than 1.9.

9. If the difference in electronegativity between two atoms is zero (they have identical electronegativities), then the two atoms will not form an ionic bond.

10. A covalent bond formed by sharing two electrons is called a double bond.

11. In the hydrogen molecule (H2), the shared pair of electrons completes the valence shell of each hydrogen.

12. In the molecule CH4, each hydrogen and carbon have an electron configuration like that of neon.

13. In carbon dioxide,O--C--O , carbon is surrounded by four pairs of electrons and the VSEPR model predicts 109.5° for the O-C-O bond angle.

14.For a central atom surrounded by four regions of electron density, the VSEPR model predicts bond angles of 360 degrees/4=90 degrees.

15. The VSEPR model applies equally well to covalent compounds of carbon, nitrogen, and oxygen.

16. Given the assumptions of the VSEPR model, the only bond angles it predicts for compounds of carbon, nitrogen, and oxygen are 109.5°, 120°, and 180°.

17. The letters VSEPR stand for valence-shell electron-pair repulsion.

Answer 1