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Atomic Structure and Isotopes Quiz

Created by

@ImprovingRiver

Questions and Answers

What does the mass number of an atom represent?

The total number of protons in the nucleus

The total number of neutrons in the nucleus

The sum of protons and neutrons in the nucleus (correct)

The number of electrons in a neutral atom

Which of the following statements about isotopes is correct?

Isotopes of an element have the same atomic number (correct)

Isotopes have different chemical properties

Isotopes differ in their atomic number

Isotopes of an element have the same mass number

How is the atomic mass of an element determined?

The sum of the atomic numbers of all isotopes

The sum of the isotopic masses weighted by their abundance (correct)

The largest isotopic mass of the element

The average of the isotopic masses of all known isotopes

What is the charge of an ion that results from a metal atom losing two electrons?

Positive two Signup and view all the answers

If the atomic mass of boron is given as 10.81 g/mol, which of the following must be true?

The average mass accounts for the abundances of boron-10 and boron-11 Signup and view all the answers

Which notation correctly represents the isotopes of boron?

B₅¹⁰ and B₅¹¹ Signup and view all the answers

What distinguishes a cation from an anion?

Cations have a positive charge, anions have a negative charge Signup and view all the answers

If an atom has 6 protons, 6 neutrons, and 5 electrons, what is its charge?

Positive one Signup and view all the answers

Study Notes

Atomic Structure

Atomic symbol (X) represents an element.
Mass number (A) is the total number of protons and neutrons; calculated as A = Z + N.
Atomic number (Z) is the number of protons and electrons in the nucleus.
Number of neutrons (N) can be found using the formula N = A - Z.

Isotopes

Isotopes are variations of an element with the same number of protons but different numbers of neutrons.
They maintain the same atomic number but have differing mass numbers.

Atomic Mass

Atomic mass (or atomic weight) is the weighted average of the masses of an element's naturally occurring isotopes.
This average is calculated based on the isotopes' natural abundances.

Ions

An ion is defined as an atom or molecule with an electric charge.
Ions are denoted with a superscript indicating the size and sign of the charge.
When a metal atom loses electrons, it forms a cation, which is a positively charged ion.

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Description

Test your understanding of atomic structure, isotopes, and ions with this quiz. Explore key concepts such as mass number, atomic number, and atomic mass. This quiz will challenge your knowledge of elemental variations and ion formation.