9ps\natomic number, mass number, isotopes, and stuff\n1 complete the following questions. assume all atoms…

9ps\natomic number, mass number, isotopes, and stuff\n1 complete the following questions. assume all atoms are neutral.\n $_2^4he$\n element: ____\n # protons: ____\n # neutrons: ____\n $_ {26}^{56}fe$\n element: ____\n atomic #: ____\n mass #: ____\n $_{13}^{27}al$\n element: ____\n # protons: ____\n # electrons: ____\n $_{20}^{40}ca$\n element: ____\n # protons: ____\n # neutrons: ____\n # electrons: ____\n $_{10}^{20}ne$\n element: ____\n atomic #: ____\n # electrons: ____\n atomic mass: ____\n $_6^{14}c$\n element: ____\n # protons: ____\n # electrons: ____\n # neutrons: ____\n $_9^{19}f$\n element: ____\n atomic #: ____\n mass #: ____\n # electrons: ____\n $_1^1h$\n element: ____\n atomic #: ____\n # electrons: ____\n # neutrons: ____\n $_1^2h$\n element: ____\n # protons: ____\n # electrons: ____\n # neutrons: ____\n2. write the symbol for the isotope...\n a. with 8 protons and 8 neutrons\n b. with 28 protons and 30 neutrons\n c. with atomic # 11 and mass # of 23\n d. with 92 protons and mass # 238\nhow many neutrons are in this isotope?

9ps\natomic number, mass number, isotopes, and stuff\n1 complete the following questions. assume all atoms are neutral.\n $_2^4he$\n element: ____\n # protons: ____\n # neutrons: ____\n $_ {26}^{56}fe$\n element: ____\n atomic #: ____\n mass #: ____\n $_{13}^{27}al$\n element: ____\n # protons: ____\n # electrons: ____\n $_{20}^{40}ca$\n element: ____\n # protons: ____\n # neutrons: ____\n # electrons: ____\n $_{10}^{20}ne$\n element: ____\n atomic #: ____\n # electrons: ____\n atomic mass: ____\n $_6^{14}c$\n element: ____\n # protons: ____\n # electrons: ____\n # neutrons: ____\n $_9^{19}f$\n element: ____\n atomic #: ____\n mass #: ____\n # electrons: ____\n $_1^1h$\n element: ____\n atomic #: ____\n # electrons: ____\n # neutrons: ____\n $_1^2h$\n element: ____\n # protons: ____\n # electrons: ____\n # neutrons: ____\n2. write the symbol for the isotope...\n a. with 8 protons and 8 neutrons\n b. with 28 protons and 30 neutrons\n c. with atomic # 11 and mass # of 23\n d. with 92 protons and mass # 238\nhow many neutrons are in this isotope?

Answer

Explanation:

Step1: Recall atomic - related concepts

The atomic number ($Z$) is equal to the number of protons. For a neutral atom, the number of electrons is equal to the number of protons. The mass number ($A$) is the sum of the number of protons and neutrons ($A = p + n$), so the number of neutrons $n=A - p$.

Step2: Analyze $\ce{_2^4He}$

  • Element: Helium

  • protons: 2 (from the sub - script)

  • neutrons: $4 - 2=2$ (mass number 4 minus proton number 2)

Step3: Analyze $\ce{_{26}^{56}Fe}$

  • Element: Iron
  • Atomic # (same as # protons): 26
  • Mass #: 56

Step4: Analyze $\ce{_{13}^{27}Al}$

  • Element: Aluminum

  • protons: 13

  • electrons: 13 (since it's neutral)

Step5: Analyze $\ce{_{20}^{40}Ca}$

  • Element: Calcium

  • protons: 20

  • neutrons: $40 - 20 = 20$

  • electrons: 20

Step6: Analyze $\ce{_{10}^{20}Ne}$

  • Element: Neon
  • Atomic #: 10

  • electrons: 10

  • Atomic mass (same as mass number here): 20

Step7: Analyze $\ce{_{6}^{14}C}$

  • Element: Carbon

  • protons: 6

  • electrons: 6

  • neutrons: $14 - 6=8$

Step8: Analyze $\ce{_{9}^{19}F}$

  • Element: Fluorine
  • Atomic #: 9
  • Mass #: 19

  • electrons: 9

Step9: Analyze $\ce{_1^1H}$

  • Element: Hydrogen
  • Atomic #: 1

  • electrons: 1

  • neutrons: $1 - 1 = 0$

Step10: Analyze $\ce{_1^2H}$

  • Element: Hydrogen (isotope called deuterium)

  • protons: 1

  • electrons: 1

  • neutrons: $2 - 1=1$

Step11: Write isotope symbols for part 2

  • a. With 8 protons and 8 neutrons, atomic number $Z = 8$ (oxygen), mass number $A=8 + 8=16$. Symbol: $\ce{_8^{16}O}$
  • b. With 28 protons and 30 neutrons, atomic number $Z = 28$ (nickel), mass number $A=28+30 = 58$. Symbol: $\ce{_{28}^{58}Ni}$
  • c. With atomic # 11 (sodium) and mass # 23, symbol: $\ce{_{11}^{23}Na}$
  • d. With 92 protons (uranium) and mass # 238, symbol: $\ce{_{92}^{238}U}$

Answer:

$\ce{_2^4He}$:

  • element: Helium

  • protons: 2

  • neutrons: 2

$\ce{_{26}^{56}Fe}$:

  • element: Iron
  • atomic #: 26
  • mass #: 56 $\ce{_{13}^{27}Al}$:
  • element: Aluminum

  • protons: 13

  • electrons: 13

$\ce{_{20}^{40}Ca}$:

  • element: Calcium

  • protons: 20

  • neutrons: 20

  • electrons: 20

$\ce{_{10}^{20}Ne}$:

  • element: Neon
  • atomic #: 10

  • electrons: 10

  • atomic mass: 20 $\ce{_{6}^{14}C}$:
  • element: Carbon

  • protons: 6

  • electrons: 6

  • neutrons: 8

$\ce{_{9}^{19}F}$:

  • element: Fluorine
  • atomic #: 9
  • mass #: 19

  • electrons: 9

$\ce{_1^1H}$:

  • element: Hydrogen
  • atomic #: 1

  • electrons: 1

  • neutrons: 0

$\ce{_1^2H}$:

  • element: Hydrogen

  • protons: 1

  • electrons: 1

  • neutrons: 1

  • a. $\ce{_8^{16}O}$
  • b. $\ce{_{28}^{58}Ni}$
  • c. $\ce{_{11}^{23}Na}$
  • d. $\ce{_{92}^{238}U}$