Consider the following atoms in which X represents the chemical symbol of the element: (4.4,4.5)

step 1 Here we're looking at some different elements and so the following elements all have the same nu

Consider the following atoms in which X represents the...

Consider the following atoms in which $\mathrm{X}$ represents the chemical symbol of the element: (4.4,4.5) $\begin{array}{llll}{ }_{19}^{42} \mathrm{X}, & { }_{9}^{18} \mathrm{X}, & { }_{8}^{18} \mathrm{X}, & { }_{20}^{42} \mathrm{X}, & { }_{20}^{43} \mathrm{X}\end{array}$ a. Which atoms have the same number of protons? b. Which atoms are isotopes? Of what element? c. Which atoms have the same mass number?

Consider the following atoms in which $\mathrm{X}$ represents the chemical symbol of the element: (4.4,4.5)
$\begin{array}{llll}{ }_{19}^{42} \mathrm{X}, & { }_{9}^{18} \mathrm{X}, & { }_{8}^{18} \mathrm{X}, & { }_{20}^{42} \mathrm{X}, & { }_{20}^{43} \mathrm{X}\end{array}$
a. Which atoms have the same number of protons?
b. Which atoms are isotopes? Of what element?
c. Which atoms have the same mass number?

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Key Concepts

Element Identity

Element identity depends solely on the atomic number of the atom, meaning atoms with the same number of protons are the same element. This is crucial for establishing chemical behavior and for identifying isotopes which are variations of the same element.

Isotopes

Isotopes are atoms of the same element—meaning they have the same atomic number, and thus the same number of protons—but differ in the number of neutrons. This results in different mass numbers but the same chemical properties, as isotopes belong to one and the same element.

Atomic Number

The atomic number of an atom represents the number of protons in its nucleus. This number uniquely identifies the chemical element and is used to determine the element's position in the periodic table. Atoms with the same atomic number are the same element regardless of their neutron count.

Mass Number

The mass number of an atom is the sum of the number of protons and neutrons in its nucleus. It represents the total nucleon count and is used to determine the isotope of the element involved. Atoms with the same mass number have an equal combined count of protons and neutrons.

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