Introduction to Chemistry

Chemistry

Unit 10

Vocab

Element
Made up of identical atoms
Examples: Iron, oxygen, gold, aluminum, carbon

Vocab

● Atom

○ Smallest part of an element that retains its properties

○ Made of protons, neutrons, and electrons

Multiple Choice

All of the iron in a car is made of only one type of atom.

• No, that's silly

• Yes, totally true

Multiple Choice

What is smallest part of an element that still has its properties?

• An atom

• A proton

• A neutron

• An electron

Multiple Select

What three things make up an atom?

• Proton

• Electron

• Neutron

• Element

Vocab

● Proton

○ Positive charge
○ Found in the nucleus (center) of an atom
○ 1 AMU (atomic mass unit)
○ Identifies the atom
○ Abbreviation p⁺

Drag and Drop

What is true about a PROTON​

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has a positive charge

it identifies the atom

it is found in the nucleus

weighs 1 AMU

weighs 2 AMU

has no charge

Vocab

● Neutron

○ Found in the nucleus
○ No charge
○ 1 AMU (atomic mass unit)
○ Helps to make the nucleus stable
○ n⁰

Drag and Drop

What can you say about a neutron?​

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it has no charge

it is found in the nucleus

helps to hold the nucleus together

has a positive charge

weighs 4 AMU

Vocab

● Electron

○ Found outside the nucleus
○ Negative charge
○ 1/1836 AMU (atomic mass unit)
○ Balance the proton’s + charge
For an atom the number of protons number of equals electrons
○ e^-

Drag and Drop

What can you say about an electron?​

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it has a negative charge

has almost no mass ( 1/1836 AMU(

found outside of the nucleus

weighs 2 AMU

found in the nucleus

equals the number of protons

equals the number of neutrons

Atomic Number

● The number of p⁺ (and same number of e^-)
● Cannot change
● Identifies the atom

Drag and Drop

What can you say about ATOMIC NUMBER?​

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it identifies an element

it cannot change

it equals the number of protons

it's the same number as electrons

it changes

protons plus neutrons

Mass number

Number of p⁺ and average number of n⁰
This is the mass number has decimals #average
Yo! Round this to the
nearest whole number!