The Building Blocks of the Chemical World Questions
1. Copy and fill in the blanks. a. All substances are made up of very small particles called
.
b. Substances that contain only one type of are called
.
c. The number of protons in a carbon atom is
.
d. The three subatomic particles are , .
and e. The and found in the nucleus of the atoms.
f. The atomic number is the number of in the nucleus of the atom.
g. The mass number is the number of and
nucleus of the atom.
h. An isotope is an atom of the same element that has the same a different
number. Isotopes
have the same number of different numbers of
but .
i. In the periodic table vertical columns of elements are called
and
horizontal rows of elements are known as .
j. Metals are substances that have a high and can conduct .
and
2. Why are water (H2O) and carbon dioxide (CO2) not considered to be elements?
3. Write down the names of two elements that, at room temperature, are: a. Solids
b. Liquids c. Gases
number but in the are
4. Use the table below to answer the following questions.
Element Oxygen Chlorine Zinc
Tungsten
Atomic number 8
17 30 74
Mass number 16 35 65
187
a. Which element has the highest number of protons?
b. How many protons are in an atom of oxygen?
c. Where are protons found in the atom? d. How many neutrons are in an atom of zinc? e. Which element contains the same number of protons and neutrons?
f. Draw and write the electronic configuration for oxygen and chlorine.
5. The table below shows the data for six elements. Turn to page 462 to see where these elements are found on the periodic table.
