The element has a mass number of 28 and 15 neutrons is Aluminium.
- All elements have are made up particles sch as neutrons, protons and electrons.
- Inside the atom of every element contains the protons and neutrons which collectively are called The nucleon.
- The number of protons,P and neutrons,N give the mass nmber of the element as represented by A, So,
A= P +N
- In a neutral atom, the number of protons equals number of electrons.
Now given an element with mass number 28 and 15 neutrons, we first find the proton number
A= P +N
28= P +15
P=28-15
P=13
The proton number of an element is also the same as its atomic number,The atomic number of an element tells us the identity of that element , therefore the element with atomic number 13 is Aluminum
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