Question

protons, neutrons and mass number: 1. mass number = number proton + mass number 2. an isotope is often written with the element followed by the 3. write an example of an isotope of oxygen with a mass of 14. average atomic mass you might have noticed that the periodic table does not list mass numbers or the numbers of neutrons. this is because each element can have several isotopes. this is because each element can have several isotopes. however, you might notice that a decimal number is listed with most elements atomic mass of the element. the average atomic mass of the element’s isotopes, weighted decimal number is the average mass of the element’s isotopes. the average atomic mass of an element is the average mass of each isotope according to the abundance of each isotope. the figure on the left shows the block for carbon from the periodic table. the atomic mass of carbon is 12.01. the average atomic mass of carbon is 12.01. why isn’t the average atomic mass of carbon 13? the average atomic mass of carbon’s three isotopes, 12, 13 and 14 is 13. the average atomic mass of each isotope... for example, to determine the mass number of an atom, you must know the number of neutrons and the number of protons in the atom. the mass numbers of the isotopes of carbon are shown in the table above. an isotope is often written with the element name followed by the mass number. using this method, the isotopes of carbon are written as carbon-12, carbon-13, and carbon-14. you can determine any one of these three quantities if you know the value of the other two quantities. the mass number of an atom is the sum of the number of protons and neutrons in an atom. this is shown in the following equation. mass number = number of protons + number of neutrons

Explanation:

Step1: Fill mass number formula

$\text{Mass number} = \text{number of protons} + \text{number of neutrons}$

Step2: Fill isotope naming rule

An isotope is often written with the element name followed by the mass number.

Step3: Write oxygen isotope example

Oxygen-14

Answer:

1. $\text{Mass number} = \text{number of protons} + \text{number of neutrons}$
2. name; mass number
3. Oxygen-14