Question

what is the mass number if you have 15 protons, 17 neutrons, and 18 electrons?
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what is the atomic number if you have 15 protons, 17 neutrons, and 18 electrons?
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what is the element if you have 15 protons, 17 neutrons, and 18 electrons?
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what is the net charge if you have 15 protons, 17 neutrons, and 18 electrons?
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Explanation:

Step1: Recall mass - number formula

The mass number ($A$) is the sum of protons and neutrons. Given protons ($p$) = 15 and neutrons ($n$) = 17.
$A=p + n$

Step2: Calculate mass number

$A=15 + 17=32$

Step3: Recall atomic - number definition

The atomic number ($Z$) is equal to the number of protons. Given protons = 15, so $Z = 15$.

Step4: Identify the element

The element with atomic number 15 is phosphorus (P).

Step5: Calculate net charge

The charge of a proton is +1, the charge of an electron is - 1, and neutrons are neutral. Given protons ($p$)=15, electrons ($e$)=18. Net charge ($Q$) is $Q=p - e$.
$Q = 15-18=-3$

Answer:

Mass Number: 32
Atomic Number: 15
Element: Phosphorus (P)
Net Charge: - 3