Reading: The Basics of Atomic Structure

What are the three main categories of elements?

• Metals, nonmetals, and metalloids

• Metals, gases, and liquids

• Solids, liquids, and gases

• Metalloids, gases, and liquids

Which of the following is a property of metals?

• Good conductors of electricity

• Poor conductors of electricity

• Brittle solids

• Gaseous at room temperature

What determines the identity of an element?

• The number of protons in the nucleus

• The number of neutrons in the nucleus

• The number of electrons in the electron cloud

• The atomic mass of the element

What is the role of electrons in an atom?

• Involved in chemical reactions and bonding

• Determine the atomic mass

• Contribute to the atomic number

• Make up most of the atom's mass

Tags

NGSS.MS-PS1-5

What does the atomic number of an element represent?

• The number of protons in its nucleus

• The average mass of its atoms

• The number of neutrons in its nucleus

• The number of isotopes of the element