8. if you know only the following information can you always determine what the element is? (yes/no)\n a…

8. if you know only the following information can you always determine what the element is? (yes/no)\n a. number of protons\n b. number of neutrons\n c. number of electrons in a neutral atom\n d. number of electrons\n\nfill in the missing items in the table below. complete the table. use a periodic table where needed. there is enough information given for each element to determine all missing numbers.\n| symbol | atomic number | mass number | number of protons | number of electrons | number of neutrons |\n| ---- | ---- | ---- | ---- | ---- | ---- |\n| $^{23}$na | | | | | |\n| k | | 40 | | 19 | |\n| | | | 38 | 38 | 52 |\n| f | | | | | 10 |\n| | 20 | 41 | | 20 | |\n| | 50 | | | 50 | 72 |\n| $^{131}$i | | | | | |\n| $^{26}$mg | | | | | |\n| | | 109 | 47 | 47 | |\n| | 1 | 2 | | 1 | |\n| $^{36}$s | | | | | |\n| | 26 | | | 26 | 32 |\n| $^{27}$al | | | | | |\n| | 2 | 4 | | 2 | |\n| cr | | 53 | | | |

8. if you know only the following information can you always determine what the element is? (yes/no)\n a. number of protons\n b. number of neutrons\n c. number of electrons in a neutral atom\n d. number of electrons\n\nfill in the missing items in the table below. complete the table. use a periodic table where needed. there is enough information given for each element to determine all missing numbers.\n| symbol | atomic number | mass number | number of protons | number of electrons | number of neutrons |\n| ---- | ---- | ---- | ---- | ---- | ---- |\n| $^{23}$na | | | | | |\n| k | | 40 | | 19 | |\n| | | | 38 | 38 | 52 |\n| f | | | | | 10 |\n| | 20 | 41 | | 20 | |\n| | 50 | | | 50 | 72 |\n| $^{131}$i | | | | | |\n| $^{26}$mg | | | | | |\n| | | 109 | 47 | 47 | |\n| | 1 | 2 | | 1 | |\n| $^{36}$s | | | | | |\n| | 26 | | | 26 | 32 |\n| $^{27}$al | | | | | |\n| | 2 | 4 | | 2 | |\n| cr | | 53 | | | |

Answer

Explanation:

Step1: Determine Yes/No for each part

a. Number of protons: Atomic number = protons, unique to element → Yes. b. Number of neutrons: Isotones exist (e.g., C-14 and N-15) → No. c. Electrons in neutral atom: = protons = atomic number → Yes. d. Number of electrons: Ions have variable electrons (e.g., Cl⁻ and Ar) → No.

Step2: Fill table using Z=protons=e⁻(neutral), A=protons+neutrons

²³Na: Z=11, A=23, p=11, e⁻=11, n=12; K: Z=19, p=19, n=21; Sr-90: Z=38, A=90; F-19: Z=9, A=19, p=9, e⁻=9; Ca: Z=20, p=20, n=21; Sn: Z=50, A=122; ¹³¹I: Z=53, p=53, e⁻=53, n=78; ²⁶Mg: Z=12, p=12, e⁻=12, n=14; Ag-109: Z=47, n=62; H-2: p=1, n=1; ³⁶S: Z=16, p=16, e⁻=16, n=20; Fe: Z=26, A=58, p=26; ²⁷Al: Z=13, p=13, e⁻=13, n=14; He-4: p=2, n=2; Cr: Z=24, p=24, e⁻=24, n=29.

Answer:

a. Yes b. No c. Yes d. No

Symbol Atomic Number Mass Number Number of Protons Number of Electrons Number of Neutrons
²³Na 11 23 11 11 12
K 19 40 19 19 21
Sr 38 90 38 38 52
F 9 19 9 9 10
Ca 20 41 20 20 21
Sn 50 122 50 50 72
¹³¹I 53 131 53 53 78
²⁶Mg 12 26 12 12 14
Ag 47 109 47 47 62
H 1 2 1 1 1
³⁶S 16 36 16 16 20
Fe 26 58 26 26 32
²⁷Al 13 27 13 13 14
He 2 4 2 2 2
Cr 24 53 24 24 29