Which symbol correctly represents an element (D) whose atoms contain 15 protons and 20 neutrons?
A. 20/15 D
B. 15/20 D
C. 35/15 D
D. 15/35 D
C?
your the best
whats the anwser
What is the answer
Which of the following represents an element
To determine the symbol that correctly represents an element with a specific number of protons and neutrons, we need to understand how atomic symbols are written. Atomic symbols consist of the element's chemical symbol and its atomic number and mass number.
The atomic number represents the number of protons in the nucleus of an atom. The mass number represents the total number of protons and neutrons in the nucleus.
In this case, the element has 15 protons and 20 neutrons. Thus, its atomic number is 15.
To determine the correct atomic symbol, we look for the chemical symbol on the periodic table that corresponds to an atomic number of 15. The atomic number for phosphorus (P) is 15, which matches our requirement.
Next, we determine the correct mass number for the element. The mass number is the sum of protons and neutrons, which in this case is 15 + 20 = 35.
Therefore, the correct atomic symbol for the element is 35/15 P.
None of the answer choices provided match the correct atomic symbol for the element with 15 protons and 20 neutrons.
You really need to choose ONE screen name and keep it. It's childish to keep changing yours from "quick help needed" to other non-names you've used.
Also ... if you typed Chemistry in the School Subject box, you'd be more likely to get a response from someone who knows this subject.
Standard format is atomic number first, and atomic number second. C is correct.
I want to warn you however, standard format is not all that standardized.