Metals/Nonmetals Properties
Supplemental Instruction
Iowa State University / Leader: / Lilli Howard
Course: / Chem 177 (BC)
Instructor: / Dr. Irmi
Date: / 10/31/13

Review of Periodic Properties

  1. Size of atoms (increase/decrease) across a period and (increase/decrease) down a group.
  1. Size of ions (increase/decrease) with an added electron.
  1. There is a(n) (increase/decrease) in bonding atomic radii across a period and a(n) (increase/decrease) down a group.
  1. The size of an electron in an isoelectronic series (increases/decreases) with increasing atomic number.
  1. Ionization energies tend to (increase/decrease) across a period and (increase/decrease) down a group.

a. Ionization energy can be defined as amount of energy required to remove an electron.

  1. Electron affinities have a rough trend. They tend to (increase/decrease) across a period and (increase/decrease) down a group.

a. Electron affinities can be defined as energy released when an electron is added.

Metals

  1. T/F All metals are solid at room temperature. Mercury
  2. T/F Metals are good electrical and thermal conductors.
  3. T/F Metals tend to lose electrons in chemical reactions and become negatively charged ion called anions.
  4. T/F Compounds consisting of a metal and a nonmetal are usually molecular.
  5. T/F Metallic character is strongest on the left side of the period and decreases to the right.
  6. T/F Metallic character in a group tends to decrease from top to bottom.
  7. Which member of the following pairs has more of a metallic character?

1. Na or Rb2. K or Ca3. Pb or F4. C or Sn

Nonmetals

  1. When nonmetals react with metals they tend to (gain/lose) electrons and become (anions/cations).
  2. When nonmetals react with nonmetals they become (ionic/molecular compounds).
  3. Write balanced chemical reaction for the preparation of the following alkali metal compounds: (a) KOH (b) Cs2O (c) NaH (d) KBr

2 K + 2 H2O → 2 KOH + H2

4 Cs + O2 → 2 Cs2O

2 Na + H2 → 2 NaH

2 K + Br2 → 2 KBr

  1. Oxygen exists in two allotropic forms __O2___ and ___O3___.
  2. Allotropes are __different forms in which an element can exist___.
  1. Group 7 contains F, Cl, Br, and I and is called the __halogen___ family.

a. All form naturally as ___diatomic____ molecules.

b. All react with metals to form __ionic halide salts____.

c. All react with hydrogen to form gaseous HX products.

  1. Group 8 contains __He, Ne, Ar, Kr, Xe, Rn______and is called the noble gas family.

a. All are monatomic gases at room temperature.

b. They have completely filled ___s and p subshells______.

c. They have (low/high) reactivities.

  1. Write the expected formula of the product when the following elements combine to make compounds:

a. Al and OAl2O3

b. B and ClBCl3

c. Ca and FCaF2

d. Na and INaI

e. S and OSO2 or SO3

f. H and CaCaH2

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