Student Exploration: Element Builder - GIZMO (Answer Key) 100% CORRECT, SATISFACTIONS GUARANTEED 

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?

Cheese, dough, tomato sauce

2. What substances make up water?

Hydrogen and Oxygen

3. What substances make up an iron pot?

Fe (iron)

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?

Neutrons and protons

B. Which particles orbit around the nucleus?

Electrons

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

Changing number of protons

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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? Atomic number

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

Subtract atomic number from mass number

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

Negative charge? electron No charge at all? Neutron