Front

What is the atomic mass?

Back

The weighted average mass of an element's isotopes, measured in atomic mass units (amu). For example, the atomic mass of Copper (Cu) is approximately 63.546 amu.

Tags

NGSS.HS-PS1-7

Front

What do the vertical columns on the periodic table tell us?

Back

They indicate the number of valence electrons (electrons in the outermost shell) of the elements in that column.

Front

Which item on this element square represents the atomic number?

Back

The atomic number is represented by the number of protons in the nucleus of an atom, found at the top of the element square.

Front

What are the horizontal rows on the periodic table called?

Back

They are called periods.

Front

Define 'period' in the context of the periodic table.

Back

A horizontal row of elements in the periodic table.

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances by chemical means, made up of only one type of atom.

Front

What is a compound?

Back

A substance formed when two or more elements are chemically bonded together, such as water (H2O).

Tags

NGSS.MS-PS1-1

Front

What are groups in the periodic table?

Back

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

Front

What is the significance of the atomic number?

Back

The atomic number determines the identity of an element and the number of protons in its nucleus.

Front

What are metals?

Back

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