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Chemistry 100

Clark College

Chapter 4 Homework SOLUTION

Follow the homework guidelines given in the syllabus! Show your work, use units and sig figs, where appropriate.

1. Label the following elements as metals, nonmetals or metalloids.

a) Germanium

Metalloid

b) Manganese

Metal

c) Cesium

Metal

d) Krypton

Nonmetal

a)

The s-block

b)

The d-block

c)

The actinides

d)

A halogen

e)

A noble gas

f)

The p-block

2. Give the name and symbol for a unique element (use each only once) that represents:

Calcium, Ca Iron, Fe Neptunium, Np Iodine, I Argon, Ar Astatine, At

These are all just examples!

3.

Write the full chemical symbols for carbon-14, cobalt-57, and uranium-238.

carbon-14:

14 6

C

cobalt-57:

57 27

Co

uranium-238:

238 92

U

4. Deuterium and tritium are two isotopes of hydrogen, and have one neutron and two neutrons, respectively. Write the full chemical symbol for deuterium and tritium.

Deuterium:

2 1

H

Tritium:

3 1

H

Z

A

Protons

Neutrons

Electrons

14

28

14

14

14

56

138

56

82

56

77

192

77

115

77

54

131

54

77

54

5. Fill in the missing values in the table below.

Atom

Name

Si

Silicon

Ba

Barium

Ir

Iridium

Xe

Xenon

**I had errors in the silicon and iridium entries! The process remains the same, the result is a very unstable nucleus.

6. What is the difference between the mass number and the atomic mass given on the Periodic

Table? The mass number is the sum of the protons and neutrons for a particular isotope of an element. What we find on the periodic table is the average masses of all isotopes of the element.

Chapter 4 Homework

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