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Chapter 1 Atoms . Review. Uncharged particle in the nucleus of an atom. neutron. The number of neutrons plus protons in the nucleus of an atom. Mass number. The number of protons in the nucleus . Atomic number. Matter that is made up of only one kind of atom. element. - PowerPoint PPT Presentation
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Chapter 1 Atoms
Review
Uncharged particle in the nucleus of an atom
• neutron
The number of neutrons plus protons in the nucleus of an atom
• Mass number
The number of protons in the nucleus
• Atomic number
Matter that is made up of only one kind of atom
• element
A pure substance whose smallest unit is made of atoms of more than one
element• element
Region surrounding the nucleus in which the electrons move about
• Electron cloud
A negative charge particle that is part of every kind of matter
• electron
A sample of matter with the same composition and properties
throughout• substance
Atoms of the same element that have different number of neutrons
• isotopes
Elements that make up about 97% of the human body
• nonmetals
Elements that generally have a shiny or metallic luster
• metals
A positively charged particle in the nucleus
• proton
Two or more substances that are together, but not combined
• mixture
The mass of the mixture of the isotopes for an element
• Atomic mass
Elements that have characteristics of both metals and nonmetals
• metalloids
Atom, elements, atomic number, metals
Fill in the blank with the words from above.• Most elements are .___.• The periodic table lists ___.• An element is made up of only one kind of __.• Isotopes can have the same ___.
• Metals• Elements• Atom• Atomic number
Where are metalloids found on the periodic table?
• Between the metals
What led scientists to believe that the atom could be broken down into
smaller particles• Cathode rays
Elements in a ___ are always combined in the same proportion by
mass• compound
What did the Greeks name what they believed to be the tiniest part of
matter?• atom
An example of a homogenous mixture
• Air• H2O
Atoms of the same element always have the same number ___
• protons
How is an electron cloud shaped?
• sphere
What is the chemical compound for ammonia? (three Hydrogen and one
Nitrogen)• NH3
JJ Thomson discovered that ___ charges attract each other in his
cathode-ray tube experiment• opposite
___ contains only one kind of atom
• Elements
Isotopes are atoms of the same element that have a different number
of ___• neutrons
Particles in an atom’s nucleus that do not have an electric charge are called
___?• neutrons
Which is not an example of matter
• Dust particle• Air• A beam of light
Beam of light
The mass number of an atom consists of the mass of ___.
• Protons and neutrons
What does the atomic number of an element tell?
• Number of protons
How do you find the number of neutrons in an isotope?
• The atomic number from the mass number
An atom of the element with atomic number of 6 always has ___ in its
nucleus• Six protons
Rutherfod’s experiment showed that most of an atom is made of mostly___.• space
Who developed a model called the atomic theory of matter?
• John Dalton
Most of the elements found on the left side of the periodic table are___.
• metals
During Thompson’s experiments, what was affected by a magnet?
• electrons
Which of the following is NOT associated with metals?
• Electric conductivity• Brittleness• shininess
• brittleness
Water is an example of what kind of substance?
• compound
Air is an example of what kind of substance?
• Homogeneous mixture
What is matter that is NOT considered to be a single substance?
• mixture
Be able to identify all the parts of an atom and label each part
• Electron• Electron cloud• Neutron• Nucleus• Proton
Know the components of an element
• Number of protons = number of electrons• Atomic number = number of protons• Mass number = number of protons + number
of neutrons