Question

An atom that has 13 protons and 15 neutrons is isotope of the element A.) nickel B.) silicon C.) aluminum D.) phosphorus. Why?

Answer 1

The answer is c: Aluminum. You can see in the reference table that when you go to aluminum it has an atomic number of 13

Answer 2

An atom that has 13  protons and 15  neutrons  is isotope  of Aluminium (answer C)

Explanation

• Isotope  is a form of the same element with   the equal number of protons but difference number  of neutrons  in  their nuclei.

• In other words isotope has the same  atomic number but different mass  number.

• Atomic  number of a element is determined by number of  protons of an element.

• from the  periodic table   Aluminum in atomic number 13 therefore  it has 13 protons  therefore an atom that  has 13  protons and 15 neutrons is   a isotope  of Aluminium.