1. here are three isotopes of an element: (_{6}^{12}c) (_{6}^{13}c) (_{6}^{14}c) a. the element is: ________…

1. here are three isotopes of an element: (_{6}^{12}c) (_{6}^{13}c) (_{6}^{14}c) a. the element is: ________ b. the number 6 refers to the ________ c. the numbers 12, 13, and 14 refer to the ________ d. how many protons and neutrons are in the first isotope? ________ e. how many protons and neutrons are in the second isotope? ________ f. how many protons and neutrons are in the third isotope? ________ 2. complete the following chart: | isotope name | atomic # | mass # | # of protons | # of neutrons | # of electrons | | --- | --- | --- | --- | --- | --- | | uranium - 235 | | | | | | | chlorine - 35 | | | | | | | calcium - 48 | | | | | | | strontium - 90 | | | | | | | bismuth - 209 | | | | | | | boron - 11 | | | | | | | | | | 22 | 22 | | | | | | 30 | 26 | | | | 15 | 32 | | | | | | | | 34 | 45 | | | | 208 | | | 127 | | | | | | 146 | 94 | |

1. here are three isotopes of an element: (_{6}^{12}c) (_{6}^{13}c) (_{6}^{14}c) a. the element is: ________ b. the number 6 refers to the ________ c. the numbers 12, 13, and 14 refer to the ________ d. how many protons and neutrons are in the first isotope? ________ e. how many protons and neutrons are in the second isotope? ________ f. how many protons and neutrons are in the third isotope? ________ 2. complete the following chart: | isotope name | atomic # | mass # | # of protons | # of neutrons | # of electrons | | --- | --- | --- | --- | --- | --- | | uranium - 235 | | | | | | | chlorine - 35 | | | | | | | calcium - 48 | | | | | | | strontium - 90 | | | | | | | bismuth - 209 | | | | | | | boron - 11 | | | | | | | | | | 22 | 22 | | | | | | 30 | 26 | | | | 15 | 32 | | | | | | | | 34 | 45 | | | | 208 | | | 127 | | | | | | 146 | 94 | |

Answer

Explanation:

Step1: Identify the element

The symbol C represents carbon. Answer for 1a: Carbon

Step2: Define the number 6

The number 6 is the atomic number, which is the number of protons in an atom. Answer for 1b: Atomic number

Step3: Define 12, 13, 14

These are the mass - numbers. The mass - number is the sum of protons and neutrons in an atom. Answer for 1c: Mass numbers

Step4: Calculate protons and neutrons for (_{6}^{12}C)

The atomic number is 6, so the number of protons is 6. The mass - number is 12, so the number of neutrons is (12 - 6=6). Answer for 1d: 6 protons and 6 neutrons

Step5: Calculate protons and neutrons for (_{6}^{13}C)

The number of protons is 6 (from the atomic number). The number of neutrons is (13 - 6 = 7). Answer for 1e: 6 protons and 7 neutrons

Step6: Calculate protons and neutrons for (_{6}^{14}C)

The number of protons is 6. The number of neutrons is (14 - 6=8). Answer for 1f: 6 protons and 8 neutrons

For the table:

  • Uranium - 235:
    • Atomic number of uranium (U) is 92. Mass number is 235. Number of protons = 92, number of neutrons (=235 - 92 = 143), number of electrons (in neutral atom) = 92.
  • Chlorine - 35:
    • Atomic number of chlorine (Cl) is 17. Mass number is 35. Number of protons = 17, number of neutrons (=35 - 17 = 18), number of electrons = 17.
  • Calcium - 48:
    • Atomic number of calcium (Ca) is 20. Mass number is 48. Number of protons = 20, number of neutrons (=48 - 20 = 28), number of electrons = 20.
  • Strontium - 90:
    • Atomic number of strontium (Sr) is 38. Mass number is 90. Number of protons = 38, number of neutrons (=90 - 38 = 52), number of electrons = 38.
  • Bismuth - 209:
    • Atomic number of bismuth (Bi) is 83. Mass number is 209. Number of protons = 83, number of neutrons (=209 - 83 = 126), number of electrons = 83.
  • Boron - 11:
    • Atomic number of boron (B) is 5. Mass number is 11. Number of protons = 5, number of neutrons (=11 - 5 = 6), number of electrons = 5.
Isotope name atomic # mass # # of protons # of neutrons # of electrons
Uranium - 235 92 235 92 143 92
Chlorine - 35 17 35 17 18 17
Calcium - 48 20 48 20 28 20
Strontium - 90 38 90 38 52 38
Bismuth - 209 83 209 83 126 83
Boron - 11 5 11 5 6 5