PS.8.1.3 - Analyzing Element Properties

What is the atomic number of an element?

• The number of neutrons in an atom

• The number of protons in the nucleus of an atom

• The number of electrons in an atom

• The total number of protons and neutrons in an atom

Which of the following is a physical property of matter?

• Flammability

• Reactivity with acid

• Melting point

• Ability to rust

Identify the group of elements known for being highly reactive with water.

• Noble Gases

• Halogens

• Alkali Metals

• Transition Metals

Which scientist is credited with organizing the Periodic Table by atomic number?

• Mendeleev

• Moseley

• Dalton

• Rutherford

What is the term for the electrons in the outermost energy level of an atom?

• Core electrons

• Valence electrons

• Free electrons

• Bonding electrons

Which of the following elements is a metalloid?

• Silicon

• Oxygen

• Iron

• Helium

Explain why noble gases are generally unreactive.

• They have a high atomic mass.

• They have full electron shells.

• They are located in the middle of the Periodic Table.

• They have low electronegativity.

Describe the trend in atomic radius as you move across a period from left to right.

• It increases.

• It decreases.

• It remains constant.

• It fluctuates randomly.

Tags

NGSS.HS-PS1-2

Predict the reactivity of an element with one valence electron compared to an element with seven valence electrons.

• Less reactive

• More reactive

• Equally reactive

• Not reactive

How does electronegativity change as you move down a group in the Periodic Table?

• It increases.

• It decreases.

• It remains the same.

• It varies unpredictably.