(Easy!) The mass spectrum of a pure element is shown above. Based on the data, the peak at 26 amu represents an isotope of which of the following elements? A.) AI with 13 neutrons
B.) Mg with 14 neutrons
C.) Fe with 26 neutrons
D.) Ti with 26 neutrons

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Explanation:

The atomic mass of an element is the sum of the mass of its proton and neutron.

To determine isotope of the elements that represents peak at 24amu, we will determine the amount of neutron.

Mass number = number of proton + number of neutron

Atomic number = number of proton

Mass number = atomic number + number of neutron

Given mass number = 26 amu

For aluminum element;

Aluminum has atomic number of 13, to determine the number of neutron;

we will substitute mass number = 26 and atomic number = 13 into the formula;

Mass number = atomic number + number of neutron

26 = 13 + number of neutron

number of neutron = 26 - 13

number of neutron = 13

Hence the peak at 26 amu represents an isotope of Aluminum with 13 neutrons

The peak represented at 26 amu is Mg with 14 neutrons.

The peaks in a mass spectrum are used to sort out isotopes based on their respective masses.  

Isotopes have the same atomic number but different mass numbers.

There are three known isotopes of magnesium which are;  24Mg  (12 neutrons) 25Mg (13 neutrons), and  26Mg(14 neutrons).

Note that the atomic number of Mg is 12 hence, the peak at 26amu represents 26Mg which has 14 neutrons.

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