Elements Configuration

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Elements Configuration

Atomic Mass and Mass Number

Module 3 - Physical Science

Let's Practice Together!

• What is the Atomic Number?

• What is the Atomic Mass?

• How many protons are in a Lithium Atom?

• How many electrons are in a Lithium Atom?

• What is the rounded Atomic Mass?

• How many neutrons are in a Lithium Atom?

Multiple Choice

What is atomic number?

• number of protons in nucleus

• number of neutrons in nucleus

• number of protons and neutrons in nucleus

Multiple Choice

What is the atomic number of this atom?

• 9

• 10

• 19

• 27

Multiple Choice

What is the atomic number of this atom?

• 4

• 5

• 9

• none of the above

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Mass Number =

the number of protons + the number of neutrons

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Review…

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An element has 7 protons and 6 neutrons.

What is the mass number?

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Multiple Choice

What is mass number?

• number of protons in nucleus

• number of neutrons in nucleus

• number of protons and neutrons in nucleus

Multiple Choice

What is the mass number and atomic number ?

• Mass number = 7, atomic number = 14

• Mass number = 14, atomic number = 7

Element's Identity & Valence Electrons

Valence Electrons

• Valence Electrons (VE-) are the number of electrons in the outer shell/energy level that will be lost or gained in chemical bonding

• Group 1 is one of the most reactive because it only has one Valence Electron

Electrons in the outermost shell are called valence electrons.

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These are the most important electrons of an atom.

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Carbon has electron configuration 2-4. It has 4 valence electrons.

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Multiple Choice

How many valence electrons does an atom of chlorine have?

(chemical symbol Cl, atomic number 17)?

• 2

• 8

• 7

• 17