12 Week Key Terms Reteach Tutorial

What is the atomic number of an element?

• The number of protons in an atom

• The number of neutrons in an atom

• The number of electrons in an atom

• The sum of protons and neutrons in an atom

Which of the following is a chemical property?

• Color

• Density

• Reactivity with acid

• Melting point

Tags

NGSS.MS-PS1-5

Calculate the average atomic mass of an element with two isotopes: one with a mass of 10 amu and 20% abundance, and another with a mass of 11 amu and 80% abundance.

• 10.2 amu

• 10.8 amu

• 11.0 amu

• 10.5 amu

Which electron configuration represents a noble gas?

Tags

NGSS.HS-PS1-1

What is the mass number of an atom with 15 protons, 16 neutrons, and 15 electrons?

• 30

• 31

• 32

• 33

Which of the following elements is an alkali metal?

• Calcium

• Sodium

• Aluminum

• Chlorine

Explain why noble gases are generally unreactive.

• They have a full outer electron shell.

• They have high electronegativity.

• They have low ionization energy.

• They have a high atomic radius.

Which of the following best describes an ionic bond?

• Sharing of electron pairs between atoms

• Transfer of electrons from one atom to another

• Attraction between metal atoms

• Weak forces between molecules

Tags

NGSS.HS-PS1-3

What is the periodic trend for atomic radius across a period from left to right?

• Increases

• Decreases

• Remains constant

• Fluctuates

Which of the following elements is a halogen?

• Helium

• Neon

• Fluorine

• Argon