2019

Name: __Ishait Madera G___ Date: _____10/8/20_______

Student Exploration: Element Builder

Vocabulary: atom, atomic number, electron, electron dot diagram, element, energy level, ion,

isotope, mass number, neutron, nucleus, periodic table, proton, radioactive, valence electrons

Prior Knowledge Questions (Do these BEFORE using the Gizmo.)

1. What are some of the different substances that make up a pizza? __ sauce, cheese,

vegetables, and pepperoni.

2. What substances make up water? __oxygen atom and two hydrogen atoms. _________

3. What substances make up an iron pot? __ Hydrogen and Oxygen 3. _______

Elements are pure substances that are made up of one kind of atom. Pizza is not an element

because it is a mixture of many substances. Water is a pure substance, but it contains two kinds

of atom: oxygen and hydrogen. Iron is an element because it is composed of one kind of atom.

Gizmo Warm-up

Atoms are tiny particles of matter that are made up of

three particles: protons, neutrons, and electrons. The

Element Builder Gizmo shows an atom with a single

proton. The proton is located in the center of the atom,

called the nucleus.

1. Use the arrow buttons ( ) to add protons, neutrons,

and electrons to the atom. Press Play ( ).

A. Which particles are located in the nucleus?

__Protons and neutron_____

B. Which particles orbit around the nucleus?

______Electrons______________

2. Turn on Show element name. What causes the element name to change? ___subtracting

or adding neutrons and protons. _____________________________________________

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2019

Activity A:

Subatomic

particles

Get the Gizmo ready:

 Use the arrows to create an atom with two protons,

two neutrons, and two electrons.

 Turn on Show element name.

Question: What are the properties of protons, neutrons, and electrons?

1. Observe: Turn on Show element symbol and Element

notation. Three numbers surround the element symbol: the

mass number (A), electrical charge (no number is displayed if

the atom is neutral), and the atomic number (Z).

2. Investigate: Watch how the numbers change as you add or

remove particles.

A. Which number is equal to the number of protons in the atom? the atomic number___

B. How can you calculate the number of neutrons (N) in an atom? _________________

__subtract the mass by the amount the protons_________________________

C. Which particle (proton, neutron, or electron) has a positive charge? __proton____

Negative charge? __neutron___ No charge at all? __electron____

3. Analyze: An isotope is an alternative form of an element. Each isotope of an element has

the same number of protons, but a different number of neutrons. The isotope is represented

by the atomic symbol and mass number, such as He-4. Some isotopes are stable, while

others are radioactive, which means the atoms decay over time and emit radiation.

A. What are the stable isotopes of carbon? __C-6____________________

B. What are the stable isotopes of nitrogen? ___N-7_______________________

C. List two radioactive isotopes of oxygen: ___O-8_________________________

4. Practice: Use the Gizmo to answer the following questions.

A. How many electrons are in a neutral atom of lithium? __3___

B. How many neutrons are in an atom of Mg-25? __13___

C. What is the mass number of an atom with 5 protons and 7 neutrons? __12___

D. When at atom is charged, it is called an ion. How many electrons are in O2-? _1.6_

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