Atoms and the Periodic Table

What are periods in the periodic table?

• Periods are vertical columns in the periodic table that group elements with similar properties.

• Periods are horizontal rows in the periodic table that indicate the number of electron shells in the elements.

• Periods are the total number of protons in an atom's nucleus.

• Periods are the different states of matter represented in the periodic table.

What are electrons?

• Negatively charged particles that orbit the nucleus of an atom.

• Positively charged particles found in the nucleus of an atom.

• Neutral particles that exist outside the atom.

• Particles that are responsible for the mass of an atom.

What is an atom?

• An atom is the smallest unit of matter that retains the properties of an element.

• An atom is a type of molecule that can exist independently.

• An atom is a particle that is larger than a cell.

• An atom is a form of energy that can be harnessed.

What are neutrons?

• Negatively charged particles found in the nucleus of an atom.

• Neutral particles found in the nucleus of an atom.

• Positively charged particles that orbit the nucleus of an atom.

• Particles that are found outside the nucleus of an atom.

What are metalloids?

• Elements that are only metals.

• Elements that are only nonmetals.

• Elements that have properties of both metals and nonmetals.

• Elements that are radioactive.

What are nonmetals?

• Elements that are generally good conductors of heat and electricity.

• Elements that can be gases or brittle solids and are generally poor conductors of heat and electricity.

• Elements that are always found in liquid form at room temperature.

• Elements that are typically shiny and malleable.

What is atomic mass?

• The total number of protons in an atom.

• The weighted average mass of an element's isotopes, measured in atomic mass units (amu).

• The mass of an atom's nucleus only.

• The mass of an atom's electrons combined.

Why do elements in the same group have similar properties?

• They have the same atomic mass, which affects their reactivity.

• They have the same number of valence electrons, which determines their chemical behavior.

• They are all metals, which gives them similar physical properties.

• They have the same number of protons in their nuclei, leading to identical chemical properties.

What are groups in the periodic table?

• Horizontal rows in the periodic table that contain elements with different chemical properties.

• Vertical columns in the periodic table that contain elements with similar chemical properties.

• Randomly arranged sections in the periodic table that have no specific properties.

• The total number of elements in the periodic table.

What are metals?

• Elements that are typically shiny, good conductors of heat and electricity, and malleable.

• Elements that are dull, poor conductors of heat and electricity, and brittle.

• Elements that are gaseous at room temperature and have low density.

• Elements that are liquid at room temperature and highly reactive.