One isotope of a nonmetallic element has mass number 16 and 7 neutrons in the nucleus. The anion derived from the isotope has 10 electrons. Write the symbol for this anion.
I thought the answer was O^2- but this isnt correct
mass # = #p + #n
16 = #p + 7
p = 9
So it must have 9 electrons so the charge must be -1 when the anion is formed.
9F^16. 9 is the subscript; 16 is the superscript and goes at the top left.
To determine the correct symbol for the anion, we need to know the atomic number of the element. Since the isotope has a mass number of 16 and 7 neutrons, we can calculate the atomic number as follows:
Mass number = atomic number (protons) + number of neutrons
16 = atomic number + 7
Subtracting 7 from both sides:
atomic number = 16 - 7 = 9
Therefore, the element in question has an atomic number of 9.
The anion derived from this element has 10 electrons, which means it has gained an extra electron compared to its neutral state. To find the symbol for the anion, we look at the periodic table.
Based on the atomic number of 9, the element is fluorine (F). To denote that it has gained an electron and formed an anion, we write the symbol as F^-. So the correct symbol for the anion derived from the isotope with mass number 16 and 7 neutrons is F^-.
To find the symbol for the anion derived from the isotope, we need to determine the atomic number of the element.
First, subtract the number of neutrons (7) from the mass number (16) to find the number of protons in the nucleus. In this case, we have 16 - 7 = 9 protons.
Next, subtract the number of electrons (10) from the number of protons to determine the charge of the anion. Since there are more electrons than protons, the anion will have a negative charge. In this case, the charge of the anion is -1.
The atomic number of an element determines its identity in the periodic table. Since the anion has 9 protons, the element is fluorine (F), as it is the nonmetallic element with an atomic number of 9.
To write the symbol for the anion, we start with the element symbol (F) and indicate the charge using the superscript. Since the anion has a charge of -1, the symbol for the anion derived from the isotope is F^-.