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15 Questions

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Atomic Number and Mass Number

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Questions and Answers

What is the atomic number defined by?

Number of protons and electrons

Number of protons and neutrons

Number of protons (correct)

Number of neutrons and electrons

How is the mass number of a single atom calculated?

Protons / Neutrons

Protons - Neutrons

Protons + Neutrons (correct)

Protons x Neutrons

Which subatomic particle is essentially without mass?

Protons

Electrons (correct)

Neutrons

Positrons

What is the common factor among all atoms of the same element?

Atomic number Signup and view all the answers

How are protons and electrons distinguished in terms of charge?

+1 charge for protons and -1 charge for electrons Signup and view all the answers

What is the charge of a neutron?

0 Signup and view all the answers

How can one determine the atomic number of an element?

By looking at the periodic table Signup and view all the answers

What is the relationship between isotopes and mass numbers?

Isotopes have different mass numbers Signup and view all the answers

How is the mass number of an atom calculated?

A = Protons + Neutrons Signup and view all the answers

Which element has 14 protons and 15 neutrons in a specific isotope?

Silicon Signup and view all the answers

What does the mass number of an element represent?

The number of protons + neutrons in an atom of the element Signup and view all the answers

How can one calculate the number of neutrons in an atom if given the atomic and mass numbers?

Number of neutrons = Atomic number - Mass number Signup and view all the answers

Which statement is true about atomic and mass numbers?

Atomic numbers are unique to each element, while mass numbers vary for different isotopes. Signup and view all the answers

What is the relationship between atomic and mass numbers?

Atomic number is the number of protons, while the mass number is protons + neutrons. Signup and view all the answers

What distinguishes atomic number from mass number in terms of elements?

Atomic number is automatically known from the element's identity, while mass number must be determined based on neutrons. Signup and view all the answers