Week 9 CCA Test Review

Labeling an atom Electron Proton Neutron Nucleus Energy Level

Fill in the table: Subatomic ParticlesCharge Proton Negative Neutron Positive Electron Neutral/ No charge

What is the atomic mass? Protons + Neutrons Atomic Mass Atomic mass: the weight of an atom

What is the atomic number? Atomic number: Element number used to show where on the periodic table the element is found. Also, it is the number of protons. Atomic Number = Number of Protons

What are valence electrons? Electrons in the outside shell (energy level) of an atom. They are used to determine how reactive the atom is.

How can you find the number of neutrons? Atomic Mass - Atomic Number (protons) Neutrons

How do you know if an atom is neutral? If it has the same number of positive (protons) and negative (electron) charges Remember: all elements on the periodic table are neutral!

Fill in the missing information Atomic Mass9 Atomic Number Protons4 Neutrons Electrons4 Energy Levels? Valence Electrons Is this a stable atom? Is this a neutral atom? Element? Element symbol? = Rule Octet Rule 2 2 No - Valence level is not full Yes – protons = electrons Beryllium Be

Bohr Model

How is the Periodic Table arranged? By atomic number (number of protons) Groups (valence electrons) and Period (energy levels) Physical and Chemical properties

Color Metals, Non-Metals, and Metalloids

Label Groups and Periods

Most reactive groups Group 1 Group 17

Least Reactive Group Noble Gasses – Group 18

What information can be found if you know the Period of an element? Number of energy levels

What information can be found if you know the group of an element? Number of valence electrons

Most reactive groups Group 1 Group 17 Why? Group 1 only has one valence electron and group 17 only has 7. They are both 1 valence electron away from being stable (happy).

Least Reactive Group Noble Gasses – Group 18 Why? Group 18 has 8 valence electrons which fills up the valence level, meaning the atom is stable (happy)

Why do elements with similar valence level of electrons have similar chemical properties? They will react the same way, because they have the same number of valence electrons

What has similar physical and chemical characteristics to Nitrogen? Any element that is in the same family/group Nitrogen Family

Argon - Protons Remember: Atomic number = protons Protons = 18

Sodium – Atomic Mass Atomic Mass = 22 (drop the decimals)

Carbon - neutrons Remember: Atomic mass – atomic number = neutrons Neutrons = 6

Neon – atomic number Atomic Number = 10

Potassium – Valence Electrons Valence electrons st group = 1 valence electron

Potassium – Valence Electrons Energy Levels Used nd Period = 2 energy levels

Oxygen Bohr Model

Review from Unit 1 Physics

Independent Variable – What I (experimenter) change from trial to trial Dependent Variable – the outcome or results DRY MIX

Work Force + Distance = Work Examples???

Newton’s 3 Laws 1. An object at rest will stay at rest, and an object in motion will stay in motion unless acted upon by an outside force 2. F=ma 3. For every action there is an equal and opposite reaction

Balanced and Unbalanced Forces Balanced – not moving Unbalanced – moving (creates a net force)

Equations Speed = D/T Acceleration = change in speed/change in time Force = ma Work – Force x distance

Make sure you look over how to do a lab write up (steps for experimental design)