1. Monday, May 15th
Entry Task Which group is often used to kill bacteria?
Schedule:
Metalloids, radioactive elements
Objective: I can describe the properties of metalloids and radioactive elements
Homework
Read pages very carefully
Please have on desk:
ISN open to element group foldables

2. Metalloids A zig-zag line that separates metals from nonmetals
Have properties of both metals and nonmetals

3. Metalloids Silicon is the second-most common element in Earth’s crust
Found in groups 13 – 17
Some used in semi-conductors

4. Radioactive elements
The identity of an element is determined by the number of protons in the nucleus.
Chemical changes do not affect the nucleus, so chemical changes do not change the identity of the element.

5. Radioactive elements
The nucleus is held together by the strong force even though the protons repel each other.
The stability of a nucleus depends on the right mix of protons and neutrons.

6. Radioactive elements
Some elements have an unstable nucleus because they have too few or too many neutrons.
When the nucleus is unstable, particles are produced from the nucleus to restore balance. This comes with a release of energy.

7. Radioactive elements This is called radioactivity.
If the production of particles changes the number of protons, the atom is transformed into a different element.

8. Radioactive elements
An isotope is radioactive if the nucleus has too many or too few neutrons.
Scientists study radioactivity with a Geiger counter.

9. Uses of radioactivity To destroy harmful tumors
To monitor activity of organs in the body

10. Radioactive Decay
Radioactive atoms produce energy and particles from their nuclei.
The identity of the atom changes because the number of protons changes.
This is radioactive decay.

11. Radioactive Decay
Radioactive decay occurs at a steady rate that is a property of that isotope.
The time that it takes for one-half the atoms in a sample to decay is called a half-life.

12. The half-life Does not depend on the size of the sample of an isotope.
Is not affected by temperature or pressure.
A half-life can be less than a second or billions of years.

13. Tuesday, May 16th
Entry Task What are two trends as you move from left to right across the periodic table?
Schedule:
Radioactive decay activity
Objective: I will model the radioactive decay of an element.
Homework:
Complete activity questions
Please have on desk:
Pencil, calculator

14. Wednesday, May 17th
Entry Task An element has a dull surface and does not conduct electricity well. What is it?
Schedule:
Chapter 5 Review
Objective: I know and understand the concepts of 5, the Periodic Table
Homework:
Study Chapter 5
Please have on your desk:
Radioactive decay activity

15. Thursday, May 18th
Entry Task What do the elements in group 1 have in common?
Schedule:
Chapter 5 quiz
Chapter 6 introduction
Objective: I will demonstrate my understanding of Chapter 5, The Periodic Table
Homework:
Complete the Chapter 6 title page & introduction
Please have on desk:
Chapter 5 review

16. From your journal Review the group number and properties of:
Alkali metals - Metals
Alkaline earth metals - Nonmetals
Transition metals - Metalloids
Rare earth metals
Halogens
Noble gases

17. Friday, May 19th Entry Task How many words can you make from SCIENCE
Schedule:
Elements and compounds
Formulas and subscripts
Objective: I can explain how chemical formulas represent compounds
Homework
Complete the counting atoms worksheet
Read pages
Please have on desk:
ISN, textbook

18. Science Total number of words made out of Science =34
6 letter words made out of science
1). scenic 2). nieces
5 letter words made out of science
1). cines 2). cense 3). seine 4). scene 5). since 6). niece
4 letter words made out of science
1). sine 2). seen 3). sene 4). sice 5). nice 6). ices 7). cees 8). cine
3 letter words made out of science
1). sei 2). sen 3). cis 4). cee 5). sic 6). sin 7). ens 8). see 9). sec 10). nee 11). ice 12). ins
2 letter words made out of science
is in si es en ne

19. What is an element?
A pure substance that cannot be separated into anything simpler by chemical reactions or physical means
An element has only one type of atom
Gold
Oxygen

20. All elements have their own unique properties
Appearance – color, shininess, state of matter
Melting, freezing, and boiling points
# of protons and electrons
Atomic mass
Reactivity with other substances
Density
Hardness, texture

21. Elements are listed on the Periodic Table of the Elements
Elements have been placed on the periodic table based on their properties
Elements with similar properties are grouped together
3 main groups of elements:
Metals
Metalloids
Non-metals

22. What is a Compound?
A COMPOUND is a pure substance composed of two or more elements that are chemically combined.

23. Specific Ratios of Atoms!
Compounds have
Specific Ratios of Atoms!
For example, H20 is water, but H2O2 is hydrogen peroxide!

24. Unique Set of Properties!
Every Compound has a
Unique Set of Properties!
Each compound has a unique set of properties that allows you to tell it apart from other compounds.
Each compound has its own physical properties (boiling point, melting point, density, color, etc.).
Compounds can also be identified by their chemical properties (reactivity).

25. Unique Set of Properties!
Every Compound has a
Unique Set of Properties!
A compound has different properties from the elements that form it.
For example, sodium (Na) is a shiny metal that reacts with water, oxygen (O2) and hydrogen (H2) are flammable gases.
However, sodium hydroxide (NaOH) is a strong base that has many uses including soap making and glass etching.

26. Compounds can be Broken Down into Simpler Substances
Compounds can be broken down into simpler substance through chemical changes.
For example, when you open a can of Pepsi, the carbonic acid breaks down into carbon dioxide and water.
Compounds cannot be broken down by physical changes.