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Question 17
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The atomic number is indicative of _______________________.
a The number of protons in an atom
b The number of neutrons in an atom
c The number of protons plus the number of neutrons
d The number of protons plus the number of electrons
Question 26
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Which of the following is binomial nomenclature for humans?
a homo sapiens
b Homo sapiens
c Homo sapiens
d Homo Sapiens
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- Which of the following statements is incorrect? a. Isotopes have the same atomic number and different mass numbers. b. Atoms have about the same number of electrons as protons. c. All molecules consist of atoms. d. Free radicals are dangerous because they emit energyIodine 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.For this homework question I have been having difficulty figuring out what the atomic mass is for Gi + ^2 because it has 40 electrons and the heavier isotope has 42 neutrons and has a 2 new neutrons
- for 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 natureAnswer this following question in your own words: question 1: Identify the four most abundant elements in the body. question 2: Explain the relationship between an atom’s number of electrons and its relative stability. Question 3: Briefly identify a few characteristic points about the following bonds: Ionic bonds, Covalent bonds, and Hydrogen bonds. Question 4: Explain how energy is invested, stored, and released via chemical reactions? Question 5: Compare and contrast the difference between Proteins, Carbohydrates, Lipids and Nucleic acids?1.1. An atom of element X has an atomic number of 14 and a mass number of 30. Which of the following statements is correct? (A) An atom of sodium has 14 protons, 14 electrons, and 14 neutrons.(B) An atom of sodium has 14 protons, 16 electrons, and 14 neutrons(C) An atom of sodium has 14 protons, 14 electrons, and 16 neutrons.(D) An atom of sodium has 14 protons, 16 electrons, and 16 neutrons.1.2. The ability of carbon to form four covalent bonds with a variety of atoms is(A) Isomerism(B) Tetravalence(C) Hydrolysis(D) Quadravalence1.3. Water resists changing its temperature because of its … (A) High heat of vaporization(B) Low specific heat(C) High specific heat(D) Low heat of vaporization1.4. A solution where [H+] < [OH−] is more:(A) Acidic(B) Basic(C) Neutral(D) None of the above1.5. Malnourishment results when there is(A) A diet that does not provide enough fatty acids(B) A diet with short-term absence of one or more essential nutrients(C) A diet that does not provide enough…
- Alchemists were the forerunners of modern-day chemists. Many of these medieval scholars and philosophers spent their lives trying to transform lead (atomic number 82) into gold (atomic number 79). Explain why they never succeeded.A. The first shell corresponds to the first energy level, and it can hold up to 2 electrons. Hydrogen has one proton, so it has 1 electron and one vacancy. A helium atom has 2 protons, 2 electrons, and no vacancies. B. The second shell corresponds to the second energy level, and it can hold up to 8 electrons. Carbon has 6 electrons, so its first shell is full. Its second shell has 4 electrons and four vacancies. Oxygen has 8 electrons and two vacancies. Neon has 10 electrons and no vacancies. C. The third shell corresponds to the third energy level, and it can hold up to 8 electrons. A sodium atom has 11 electrons, so its first two shells are full; the third shell has one electron. Thus, sodium has seven vacancies. Chlorine has 17 electrons and one vacancy. Argon has 18 electrons and no vacancies. Figure It Out: Which of these models have unpaired electrons in their outer shell?Polonium 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.
- All ions have at least one ________ (select all that arecorrect).a. proton c. electronb. neutron d. all of the aboveThe mass number of an atom depends primarily on the number of protons and neutrons. positrons. neutrons and electrons. protons and electrons.A nitrogen atom has 7 protons, and the most commonisotope of nitrogen has 7 neutrons. A radioactive isotopeof nitrogen has 8 neutrons. Write the atomic number andmass number of this radioactive nitrogen as a chemicalsymbol with a subscript and superscript.
