Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key


Play button


Play button




Click to flip

9 Cards in this Set

  • Front
  • Back

Atomic Number

Number of protons in an atom


The particles that make up all materials; the smallest part of an element that can take part in a chemical reaction.

Electron Configuration

Arrangement of electrons in electron shells.

Electron Shells

Also known as energy levels, the regions surrounding the nucleus, where the electrons are found.


A substance composed of atoms with the same atomic number; 118 are known to exist.

Energy levels

Also known as electron shells, the regions surrounding the nucleus where electrons may be found.

Ground State

The lowest energy arrangement of an atom's electrons in energy levels (shells)

Indirect Evidence

Evidence that does not involve direct observation.


Heavy core at the centre of the atom,made of protons, and neutrons.