Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 2, Problem 4RQ
If xenon has an atomic number of 54 and a mass number of 108, how many neutrons does it have?
- 54
- 27
- 100
- 108
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What if there are a different number of Neutrons?
Sometimes elements have a different number of neutrons than usual, so therefore have a different atomic mass. This is what we call an Isotope (a variant form of an element which has the same number of protons but a differing number of neutrons).
Sometimes we’ll see Isotopes labeled with their new mass like this:
14C = this is Carbon 14. Notice it has a different mass than what is on your periodic table
The average mass of all the isotopes is defined as an element’s Atomic Weight. Can you answer questions about these Isotopes?
ELEMENT
ATOMIC MASS
NUMBER OF PROTONS
NUMBER OF NEUTRONS
14C
A
B
C
15N
D
E
F
2H
G
H
I
Use your table to look up the number of protons, remember that never changes!
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
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
Biology 2e
Ch. 2 - Figure 2.3 How many neutrons do carbon-12 and...Ch. 2 - Figure 2.7 An atom may give, take, or share...Ch. 2 - Figure 2.24 Which of the following statements is...Ch. 2 - If xenon has an atomic number of 54 and a mass...Ch. 2 - Atoms that vary in the number of neutrons found in...Ch. 2 - Potassium has an atomic number of 19. What is its...Ch. 2 - Which type of bond represents a weak chemical...Ch. 2 - Which of the following statements is not true?...Ch. 2 - When acids are added to a solution, the pH should...Ch. 2 - We call a molecule that binds up excess hydrogen...
Ch. 2 - Which of the following statements is true? Acids...Ch. 2 - Each carbon molecule can bond with as many as...Ch. 2 - Which of the following is not a functional group...Ch. 2 - What makes ionic bonds different from covalent...Ch. 2 - Why are hydrogen bonds and van der Waals...Ch. 2 - Discuss how buffers help prevent drastic swings in...Ch. 2 - Why can some insects walk on water?Ch. 2 - What property of carbon makes it essential for...Ch. 2 - Compare and contrast saturated and unsaturated...
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- Polonium is a rare element with 33 radioisotopes. The most common one, 210Po, has 82 protons and 128 neutrons. When 210Po decays, it emits an alpha particle, which is a helium nucleus (2 protons and 2 neutrons). 210Po decay is tricky to detect because alpha particles do not carry very much energy compared to other forms of radiation. For example, they can be stopped by a single sheet of paper or a few inches of air. That is one reason that authorities failed to discover toxic amounts of 210Po in the body of former KGB agent Alexander Litvinenko until after he died suddenly and mysteriously in 2006. What element does an atom of 210Po become after it emits an alpha particle?arrow_forwardPolonium is a rare element with 33 radioisotopes. The most common one, 210Po, has 82 protons and 128 neutrons. When 210Po decays, it emits an alpha particle, which is a helium nucleus (2 protons and 2 neutrons). 210Po decay is tricky to detect because alpha particles do not carry very much energy compared to other forms of radiation. They can be stopped by, for example, a sheet of paper or a few inches of air. This property is one reason why authorities failed to discover toxic amounts of 210Po in the body of former KGB agent Alexander Litvinenko until after he died suddenly and mysteriously in 2006. What element does an atom of 210Po decay into after it emits an alpha particle?arrow_forwardPolonium is a rare element with 33 radioisotopes. The most common one, P210o, has 84 protons and 126 neutrons. When P210o decays, it emits an alpha particle, which is a helium nucleus 2 protons and 2 neutrons. P210o decay is tricky to detect because alpha particles do not carry very much energy compared to other forms of radiation. For example, they can be stopped by a single sheet of paper or a few inches of air. That is one reason why authorities failed to discover toxic amounts of P210o in the body of former KGB agent Alexander Litvinenko until after he died suddenly and mysteriously in 2006. What element does an atom of P210o change into after it emits an alpha particle.arrow_forward
- Figure 2.3 How many neutrons do (K) potassium-39 and potassium-40 have, respectively?arrow_forwardPolonium is a rare element with 33 radioisotopes. The most common one, 210Po, has 82 protons and 128 neutrons. When 210Po decays, it emits an alpha particle, which is a helium nucleus (2 protons and 2 neutrons). 210Po decay is tricky to detect because alpha particles do not carry very much energy compared to other forms of radiation. They can be stopped by, for example, a sheet of paper or a few inches of air. This property is one reason why authorities failed to discover toxic amounts of 210Po in the body of former KGB agent Alexander Litvinenko until after he died suddenly and mysteriously in 2006. What element does an atom of 210Po decay into after it emits an alpha particle?arrow_forwardfor the first 10 atoms from the periodic table determine: the atom full name and chemical symbol atomic number atomic mass how many protons, Neutrons and electrons? Abundance in naturearrow_forward
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- Iodine has 37 known isotopes. Therefore, the atomic mass has a range of 108-144 amu. Which of the following statements concerning iodine is correct? A) The isotopes of iodine have between 55 and 91 protons. B) An atom of iodine can have between 55 and 91 neutrons. C) The isotopes of iodine will always have the same number of neutrons, but the protons can vary. D) The isotopes of iodine have between 108 and 144 neutrons, but the number of protons will not vary.arrow_forwardElements have varying numbers of protons, neutrons, and electrons.True or false?arrow_forwardAccording to chemist John Dalton, if one mole of nitrogen is combined with three moles of hydrogen to form one mole of ammonia (knowing that nitrogen, with an atomic number of 7, has an atomic mass of 14, and hydrogen, with an atomic number of 1, has an atomic mass of 1), then this compound will have an atomic weight (or molecular mass) of: 14 grams per mole (14 daltons) 17 grams per mole (17 daltons) 20 grams per mole (20 daltons) 22 grams per mole (22 daltons) 43 grams per mole (43 daltons)arrow_forward
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