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The smallest piece of an element:
The cloud-like space that electrons travel around:
Protons and neutrons are found in the center of the atom called the:
Classification system for elements is called:
The Periodic Table of Elements
The subatomic particles are called:
protons, nucleus and electrons
protons, electrons and neutrons
protons, positives and negatives
cloud, shell and quarks
Substances that have only one kind of atom are called:
Electrons have a _____ charge.
both positive and negative
What is the study of matter?
_____ is what scientists think atoms are like.
The atomic structure
The atomic theory
The abbreviation for an element:
Who invented the simplified version of the atom?
Sir Isaac Newton
The scientist who invented the classification system for the elements:
Sir Isaac Newton
What is the sum of an atom's protons and neutrons called?
The columns on the periodic table that are color coded and describe the number of electrons in the outer shell of the atomic structure of the element:
The rows or periods on the periodic table describe:
the same number of outer electrons
the same number of shells
the same number of protons
the same mass
The _____ is based on the number of protons in the nucleus of the atom.
periodic table of the elements
What subatomic particle is represented by this symbol (+):
What subatomic particle is represented by this charge (-):
Why do the electrons surround the nucleus?
the negative electrons are attracted to the neutral neutrons
the negative electrons are repelled by the neutral neutrons
the negative electrons are attracted to the positive protons
the negative electrons are repelled by the positive protons
All matter is made of _____.