Question

14 question (3 points)
an neutral atom has 60 electrons and a mass number of 143.
4th attempt
part 1 (1 point)
how many protons does this atom have? 60
part 2 (1 point)
how many neutrons does this atom have? 83
part 3 (1 point)
what is the symbol of this atom? enter both the mass and the atomic number.

Explanation:

Step1: Recall atom - electron - proton relationship

In a neutral atom, the number of electrons equals the number of protons. Given 60 electrons, the number of protons is 60.

Step2: Calculate number of neutrons

The mass number is the sum of protons and neutrons. Let $n$ be the number of neutrons, $p$ be the number of protons, and $A$ be the mass - number. So $A=p + n$. Given $A = 143$ and $p = 60$, then $n=A - p=143 - 60=83$.

Step3: Determine the element symbol

The atomic number $Z$ is equal to the number of protons. Here $Z = 60$. The element with atomic number 60 is Neodymium, symbol $Nd$. The notation for an atom is $_{Z}^{A}X$, so the symbol is $_{60}^{143}Nd$.

Answer:

Part 1: 60
Part 2: 83
Part 3: $_{60}^{143}Nd$