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April 26, 2015

Homework Help: chemistry

Posted by Vishnu on Saturday, October 4, 2008 at 11:23pm.

Select all true statements from the following:

a. ) Metals are good conductors of heat and electricity.
b. ) Nonmetals generally react by forming covalent bonds (i.e. sharing electrons) or by gaining electrons to form anions.
c. ) Halogen atoms have the highest ionization energies amongst all groups in the periodic table.
d. ) All nonmetal atoms release energy when forming a 1- anion.



Is the following thinking correct?

a) Metals are good conductors of heat and electricity.
True

b) Nonmetals are generally not reactive.
Sometimes true. The coinage metals (i.e. Cu, Ag, Au, Pt) are not very reactive. Alkali metals are extremely reactive.

c) Metals generally have lower ionization energy than nonmetals.
True. The electrons of metals are easily removed.

d) All nonmetal atoms release energy when forming a 1- anion.
True for halogens. The addition of an electron to an atom to make the anion results in a product with a lower energy. Also look at the heats of formation of anions in aqueous solutions. All are negative, indicating that energy is released.

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