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Define this...
Atomic Structure
Discovery
V is for ...
PT
100
A substance that cannot be broken down into other substances is called a(n)
Element
100
What two particles are found in the nucleus?
Neutrons and protons
100
Who created the first periodic table?
Mendeleev
100
The particles fartherst away from the nucleus of an atom are the -
valence electrons
100
What happens to the atomic number as you go right on the periodic table?
It increases.
200
What is an atom?
The smallest particle of an element.
200
Why is an atom neutral?
It has the same number of protons (+) and electrons (-).
200
What is atomic mass?
The average mass of one atom of an element.
200
What is the range of the number of valence electrons?
From 1 to 8
200
What are periods and what do elements in a period have in common?
A period is a horizontal row on the periodic table. The elements all have the same number of energy levels.
300
This particle is found in the nucleus and has a postive charge.
Proton
300
The space in which the electron moves, or the electron cloud, takes up the most _____ of an atom.
volume
300
What is the atomic number?
The number of protons within the nucleus.
300
Valence electrons are important because they are involved in -
bonding with other elements.
300
What is a group or family and what do elements within a group have in common?
A group or family is a column of elements and elements within a family all have the same number of valence electrons.
400
This particle is found in the nucleus and has no charge.
Neutron
400
The nucleus (protons and neutrons) of an atom has the most ______.
mass
400
How is the MODERN Periodic Table arranged?
By atomic number.
400
Elements with the same number of valence electrons have similar-
properties
400
What can you tell about an element by its location on the periodic table?
It's properties.
500
This particle orbits the nucleus and has a negative charge.
Electron
500
Protons and neutrons are measured in what units?
Atomic mass units (AMU)
500
Why does the atomic mass vary?
Not all atoms of the element have the same number of neutrons.