IA MODIFIED MASTERING BIOLOGY WITH E TEX
12th Edition
ISBN: 9780136781752
Author: Urry
Publisher: PEARSON
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Chapter 2, Problem 1TYU
Summary Introduction
Introduction:
Radioactive isotopes are variants of an element that have an excess of energy, making them unstable. Over time, the radioactive isotope will release the excess energy in the form of radiation (such as gamma radiation). Radioisotopes can exist naturally or can be created in a lab. In medicine, they are utilized in imaging tests and also in treatment. They are also known as radionuclides.
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A nitrogen isotope with an atomic mass of 15, and an atomic number of 7, must have:
7 neutrons and 8 electrons
8 neutrons and 7 protons
7 electrons and 8 protons
8 protons and 7 neutrons
7 protons and 8 electrons
Carbon-14 is a radioactive material. It contains 6 protons and 8 neutrons.
During the process of Carbon-14 decay, one of its 8 neutrons becomes a
proton and an electron is formed in the process. Based on this information,
select all that apply.
The mass number is unchanged by the decay of Carbon-14.
The mass number is changed by the decay of Carbon-14.
After decay the atom is still Carbon.
After decay the atom is not Carbon.
An isotope of sodium (Na) has a mass number of 22 and an atomic number of 11.how many neutrons does it have?
11
12
22
44
Chapter 2 Solutions
IA MODIFIED MASTERING BIOLOGY WITH E TEX
Ch. 2.1 - MAKE CONNECTIONS Explain how table salt has...Ch. 2.1 - Is a trace element an essential element? Explain.Ch. 2.1 - Prob. 3CCCh. 2.1 - MAKE CONNECTIONS Explain how natural selection...Ch. 2.2 - Prob. 1CCCh. 2.2 - A nitrogen atom has 7 protons, and the most common...Ch. 2.2 - Prob. 3CCCh. 2.2 - Prob. 4CCCh. 2.3 - Why does the structure H C = C H fail to make...Ch. 2.3 - What holds the atoms together in a crystal of...
Ch. 2.3 - What holds the atoms together in a crystal of...Ch. 2.4 - Prob. 1CCCh. 2.4 - Which type of chemical reaction, if any, occurs...Ch. 2.4 - WHAT IF? Write an equation that uses the products...Ch. 2 - Compare an element and a Compound.Ch. 2 - DRAW IT Draw the electron distribution diagrams...Ch. 2 - In terms of electron sharing between atoms,...Ch. 2 - What would happen to the concentration of products...Ch. 2 - Prob. 1TYUCh. 2 - Prob. 2TYUCh. 2 - The reactivity of an atom arises from (A) the...Ch. 2 - Which Statement is true of all atoms that are...Ch. 2 - Which of the following statements correctly...Ch. 2 - Prob. 6TYUCh. 2 - The atomic number of sulfur is 16. Sulfur combines...Ch. 2 - What coefficients must be placed in the following...Ch. 2 - DRAW IT Draw Lewis dot structures for each...Ch. 2 - EVOLUTION CONNECTION The percentages of naturally...Ch. 2 - SCIENTIFIC INQUIRY Female luna moths (Actias luna)...Ch. 2 - Prob. 12TYUCh. 2 - Prob. 13TYU
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