Each element has a unique atomic number, which is listed on the periodic table a

Question

Each element has a unique atomic number, which is listed on the periodic table above the chemical symbol for the element. The atomic number is equal to the charge on the nucleus. The atomic number also equals the number of protons in the nucleus and the number of electrons in the neutral atom of the element.

For example, Fluorine (F) has the atomic number 9, which means that its atoms contain 9 protons and 9 electrons. Zinc (Zn) has the atomic number 30; its atoms contain 30 protons and 30 electrons.

Fill in the missing information in the table below. Use information from the periodic table to assist you, along with section 2.4 (pages 51-53) of your text.

Isotope Symbol

59/27 CO

14/? C

Give the atomic number and mass number of the following:

Atomic number

Mass number

An aluminum atom with 12 neutrons

An atom with 17 protons and 20 neutrons

Cytoxan, also known as cyclophosphamide, is widely used alone or in combination in the treatment of certain kinds of cancer. It interferes with protein synthesis and in the process kills rapidly replicating cells, particularly malignant ones. Cytoxan has the molecular formula C7H15O2N2PCl2.

How many atoms are in one molecule of Cytoxan?

What elements are present in Cytoxan?

What is the ratio of hydrogen atoms to nitrogen atoms in Cytoxan?

Isotope Symbol

59/27 CO

14/? C

Explanation / Answer

Protons         Neutrons      Electrons       Isotope symbol
27                 (59 - 27)=32      27                  59/27 Co
76                  124                    76                  200/76 Os
6                     8                        6                    14/6 C
21                  24                      21                  45/21 Sc

An aluminum atom with 12 neutrons: Atomic number 13, Mass number (13+12) = 25
An atom with 17 protons and 20 neutrons: Atomic number 17, Mass number (17+20) = 37
Cytoxan formula = C7H15O2N2PCl2
Elements in Cytoxan = Nitrogen, Carbon, Hydrogen, Phosphorous, Oxygen and Chorine
Ratio of N : H = 2 : 15

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