Introduction to Atoms

Atoms Introduction

Atoms: Basic Building Block of Matter

• Atoms are the smallest unit of an element.

• An atom of one element can’t be changed into another element

• Every atom of an element has the same number

Atoms: Law of Conservation of Matter

• Matter cannot be created or destroyed, only rearranged

• Atoms follow the LOC of Matter. You cannot destroy atoms, only combine or separate from other atoms

Multiple Choice

The Law of Conservation of Matter states that "matter is..."

• created

• destroyed

• neither created or destroyed

• created and destroyed

Multiple Choice

Do atoms follow the Law of Conservation of Matter?

• maybe

• no

• yes

• I'm just guessing and not actually reading anything and I assume that the longest answer is the correct one.

Atoms

• Atoms are made of subatomic (sub = lower/smaller) particles called:

  • protons

  • neutrons

  • electrons

Multiple Choice

Which of the following is NOT a subatomic particle found in an atom?

• proton

• neutron

• electron

• mitochondria

Protons

• Positively charged

• Located in the nucleus

• Mass is 1 AMU (atomic mass unit)

• The number of protons determines the type of element on the Periodic Table

Neutrons

• Neutrally charged

• Located in the nucleus

• Mass is 1 AMU (atomic mass unit)

Electrons

• Negatively charged

• Located in the electron cloud (surrounds the nucleus)

• Have almost no mass

Subatomic
Particle

Type of
Charge

Location

Atomic
Mass Unit

Proton

Positive

In the
Nucleus

1 AMU

Neutron

Neutral

In the
Nucleus

1 AMU

Electron

Negative

Outside the
Nucleus

0 AMU

Multiple Choice

Which subatomic particle is positively charged?

• proton

• neutron

• electron

• negatron

Multiple Choice

Which subatomic particle is negatively charged?

• proton

• neutron

• electron

• negatron

Multiple Choice

Which subatomic particle is neutrally charged?

• proton

• neutron

• electron

• negatron

Label an Atom

Label an Atom

​Electron

​Neutron

​Proton

Labelling

Label the subatomic particles of the atom

Drag labels to their correct position on the image

electron

proton

neutron

nucleus

Atoms

• # of protons = # of electrons in a neutral atom (think of zero pairs)

• neutrons do not affect the overall charge of an atom (because they are neutral)

• protons + neutrons determines the mass of an atom

  • the mass is found in the nucleus

Multiple Choice

What two things are added together to make up atomic mass?

• protons + neutrons

• protons + electrons

• electrons + neutrons

• electrons + negatrons

Multiple Choice

Which subatomic particle determines the type of atom?

• proton

• neutron

• electron

• negatron

Atomic Mass vs Atomic Number

• atomic mass = # protons + # neutrons in an atom

• Example: Find the mass of an atom with 12 protons and 12 neutrons

  • 12+12 = 24

• atomic number = number of protons OR number of electrons in a neutral atom

  • all atoms will be neutral in this class

Match

Match the subatomic particle with the correct charge.

• positive

• negative

• neutral

proton

electron

neutron

• proton

• electron

• neutron