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How many neutrons are present in an atom of Argon-38? A. 18 B. 19 C. 20 D. 21
C. 20 neutrons are present in an atom of Argon-38.
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User: How many neutrons are present in an atom of Argon-38? A. 18 B. 19 C. 20 D. 21

Weegy: C. 20 neutrons are present in an atom of Argon-38.
debnjerry|Points 44031|

User: How many neutrons are present in an atom of Iron-54? A. 25 B. 26 C. 27 D. 28

Weegy: D. 28 neutrons are present in an atom of Iron-54
yeswey|Points 2298|

User: Which element above has 6 protons in its nucleus? A. oxygen B. carbon C. phosphorus D. sulfur

Weegy: Phosphorus is the element that has 15 protons in its nucleus.



User: How many neutrons are in an atom of phosphorus with a mass number of 31? A. 31 B. 15 C. 16 D. 30

User: Which isotope has 8 neutrons and can be used for metabolic studies and to date archeological artifacts? A. oxygen-16 B. oxygen-18 C. carbon-13 D. carbon-14

Weegy: It has 6 protons and 6 neutrons. Carbon-14 is very rare. It has the same 6 protons, but 8 neutrons. [ While both are carbon elements, they are different isotopes of carbon. ]
jessMhak|Points 30|

User: What would be the correct isotope notation for an isotope of aluminum with 14 neutrons? A. B. C. D.

Weegy: What are the choices?
chinggay_0118|Points 831|

User: Which element has an atomic mass of 16.00? A. sulfur B. erbium C. oxygen D. magnesium

Weegy: The element that has an atomic mass of 16.00 is: A. sulfur.
Expert answered|sharpies|Points 8787|

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Asked 2/16/2013 12:38:05 PM
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Weegy: They have the same number of b.) electrons. User: Which two elements are in the same period? A. hydrogen (H) and neon (Ne) B. tin (Sn) and antimony (Sb) C. fluorine (F) and chlorine (Cl) D. arsenic (As) and antimony (Sb) Weegy: The answer is A. hydrogen (H) and neon (Ne) , because they are in the same period. User: Looking at the periodic table, which pair of elements will have the same number of valence electrons? User: Looking at the periodic table, which pair of elements will have the same number of valence electrons? A. silicon and germanium B. nitrogen and oxygen C. silicon and phosphorus D. hydrogen and helium User: The periodic table is called “periodic” because it is arranged to show repeating patterns. What is one of those repeating patterns? Weegy: The Law of Octaves. (More)
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