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

step 1 All right, here are four different atoms that we're looking at. X is just a theoretical element,

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

Consider the following atoms in which $\mathrm{X}$ represents the chemical symbol of the element: $(4.4,4.5)$ ${ }_{19}^{42} \mathrm{X},{ }^{18} \mathrm{X},{ }_{8}^{18} \mathrm{X},{ }_{20}^{42} \mathrm{X}, \frac{43}{20} \mathrm{X}$ 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: $(4.4,4.5)$ ${ }_{19}^{42} \mathrm{X},{ }^{18} \mathrm{X},{ }_{8}^{18} \mathrm{X},{ }_{20}^{42} \mathrm{X}, \frac{43}{20} \mathrm{X}$
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

Atomic Number

The atomic number of an atom represents the number of protons in the nucleus. It uniquely identifies a chemical element and is written as a subscript in nuclear notation. Atoms of the same element have identical atomic numbers, regardless of their number of neutrons.

Mass Number

The mass number is the total count of protons and neutrons in an atom's nucleus. It is typically denoted as a superscript in nuclear notation and helps in determining the atom’s isotopic composition. Atoms with the same mass number have an equal sum of their nucleons.

Isotopes

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons. This means they share the same atomic number (and therefore are the same element) but differ in mass number.

Nuclear Notation

Nuclear notation provides a concise way to represent the atomic structure of an element using its chemical symbol along with its mass number (as a superscript) and atomic number (as a subscript). This notation allows one to quickly determine the composition of the nucleus.

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