Atoms

What does the atomic number contribute?

# of protons and # of electrons

What determines the mass number of an atom?

# oft protons + # of neutrons

How many electrons are valid in each level?

1. 2 2. 8 3. 18

The atomic number of Silicon is 14. How many electrons are in each energy level?

1st 2 2nd 8 3rd 4

The metal thallium occurs naturally as 30 percent thallium - 203 and 70 percent thallium - 205. Calculate the atomic mass of thallium.

204.4 amu

______________ is the average mass of all the isotopes of a certain element.

Atomic mass

Which scientist discovered energy levels for atoms?

Bohr

Explain why evaporating water is a physical and not a chemical change.

Evaporation is a change of state: water to gas. Evaporation does not change the identity of the substance like a chemical change would

Explain how isotopes are similar and how they are different. Make sure to have a detailed answer.

Isotopes are similar because they contain the same number of protons. Isotopes are different because they have a different number of neutrons.

Determine the number of protons, neutrons and electrons in an atom of aluminum - 27. The atomic number for aluminum is 13. Protons __________, neutrons ____________, electrons

Protons 13, Neutrons 14, Electrons 13

What two subatomic particles are found in the nucleus?

Protons and Neutrons

Which scientist discovered protons?

Rutherford

Which scientist used the Gold-foil experiment?

Rutherford

Explain how the atomic theory has changed over time. Include in your answers the new technologies that helped with the discoveries of subatomic particles. Include scientist names and what they are famous for discovering.

The atomic theory has changed over time because of the discovery of the subatomic particle of the atom. Thomson discovered the electron with the Cathode ray tube, then Rutherford discovered the proton with the gold foil experiments. Then Dalton discovered the electrons are in different energy levels. Scientist have now discovered that protons and neutrons are made of quarks.

Explain how a rotating electric fan might be used to model he atom.

The center of a rotating electric fan is like the nucleus of an atom. The fan blades are like the energy levels where electrons are found.

Which of the details in the material we studied in this unit did you see revealed the Lord's design in His creation? Relate one of these ideas to the material you studied: complexity, beauty, simplicity, purpose, order, constants. Higher scoring answers will demonstrate a thoroughly prepared answer which includes the use of precise vocabulary of the subject matter, logical claims, rich connection(s) in the element's use(s) and application(s), and fluidity of written language.

The study of atoms revealed the Lords perfect order in creation. How something so tiny is the building blocks of all matter. That adding one proton changes the identity of an element. That atoms are neutral because of the equal number of electrons and protons. The nucleus needed neutrons to keep the protons from repelling each other.

*Scientist: Atomic theories* Which scientist discovered electrons?

Thompson

Which scientist used the cathode ray tube?

Thompson

What unit is used for the mass of subatomic particles?

amu

What is the smallest particle into which an element can be divided and still be the same substance?

atom

What does amu stand for?

atomic mas unit

Which determines the identity of an element? (mass number or atomic number)

atomic mass #

Write the isotope for carbon containing 6 protons and 8 neutrons.

carbon-14

a car rusting

chemical

burning wood

chemical

cooking an egg

chemical

Are these different elements or isotopes of the same element? Element J has 42 protons and 40 neutrons Element K has 43 protons and 40 neutrons Why?

different elements because of the # of protons

What determines an element's chemical properties?

electron arrangement

An uncharged atom has the same number of _________ and protons.

electrons

Has a negative charge

electrons

Whirls around the nucleus in a cloud

electrons

arranged in energy levels

electrons

atoms are made up of mostly

empty space

What determines if two elements are different elements or isotopes of the same element?

if they have the same number of protons

Dalton's atomic theory stated that every element was made of atoms that could not be subdivided, atoms of the same element are alike and : Atoms have many isotopes Join to form new substances

join to form new substances

Isotopes of a particular type of atom have a different number of these particles.

neutrons

has no electrical charge

neutrons

The center part of an atom containing most of the mass.

nucleus

Which energy level has the most energy?

outer most

*Physical of Chemical Change* Cutting your hair

physical

ice melting

physical

water vaporizing

physical

Isotopes of particular elements share what properties?

physical + chemical

Each type of atom has a different number of these particles

protons

Has a positive charge

protons

*Identify the Subatomic Particle* Has a mass of 1 amu

protons, neutrons

located in the nucleus

protons, neutrons

particles that make up protons and neutrons

quarks

What does the mass # contribute?

the number you subtract the atomic number from to get the number of neutrons