Atomic Number and Mass Number
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Atomic Number and Mass Number

Learn about the concept of atomic number, which represents the number of protons in an atom. Understand that atoms have no overall electrical charge due to equal numbers of protons and electrons. Explore examples like sodium with an atomic number of 11.

Created by
@AccurateHammeredDulcimer

Questions and Answers

What is the total number of protons and neutrons in a sodium atom?

23

If an atom has a mass number of 40 and an atomic number of 18, how many neutrons does it have?

58

In an atom, if the number of electrons is 20, what is the most likely number of protons?

20

Why do atoms have no overall electrical charge?

<p>Because they have equal numbers of electrons and protons.</p> Signup and view all the answers

If an atom has an atomic number of 8, how many electrons does it have?

<p>8</p> Signup and view all the answers

What is the significance of the mass number in an atom?

<p>It indicates the total number of protons and neutrons in the atom.</p> Signup and view all the answers

What defines the physical property of density?

<p>The relationship between mass and volume of a substance</p> Signup and view all the answers

Why are density measurements useful for identifying substances?

<p>To distinguish substances based on mass and volume</p> Signup and view all the answers

Which unit is commonly used to express mass?

<p>Grams</p> Signup and view all the answers

What is the formula for calculating density?

<p>$Density = Mass/Volume$</p> Signup and view all the answers

Why are feathers less dense than bricks?

<p>Feathers have higher mass and occupy less volume</p> Signup and view all the answers

What type of property is density known as?

<p>Intensive property</p> Signup and view all the answers

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