Subatomic Particles
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Periodic Table
Atom's Family
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100
The central core of the atom is called the ________.
Nucleus
100
The chemical symbol for Chlorine is
Cl
100
The chart showing the classifications of elements according to their properties and increasing atomic number is called the ____________.
Periodic Table
100
Elements arranged in vertical columns in the periodic table are called ________.
Groups or Families
100
A certain atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is _______.
56
200
The mass of an _________ is about equal to the mass of a proton.
neutron
200
Dot Diagrams are used to represent __________.
Outer level electrons or Valence Shell Electrons
200
The sum of the number of protons and neutrons in and atom is the _________.
Mass Number
200
A very stable electron arrangement in the outer energy level is a characteristic of ____________.
Noble Gases
200
At room temperature, most metals are _________.
Solids
300
According to the present atomic theory, the location of an __________ in an atom cannot be pinpointed exactly.
Electron
300
Each inner energy level of an atom has a maximum number of ________ it can hold.
Electrons
300
The atomic number of an element is determined by the number of _________.
Protons
300
Hydrogen is grouped with the alkali metals because it _______.
Has one electron in its outer energy level
300
Metals can be used in wire because they are ________.
Ductile
400
A particle that moves around a nucleus is an _______.
Electron
400
Noble Gasses are stable because ________
Their outer shell (Valence Shell) is full of electrons.
400
Horizontal rows of the periodic table are called ________.
Periods
400
Elements in Groups 3 to 12 are the
Transition elements
400
The only metal that is liquid at room temperature is ______.
Mercury
500
List the size of subatomic particles from biggest to smallest
Protons and neutrons are basically the same size and electrons are very very small.
500
A family of elements that contains the most reactive metals are _______.
Alkali Metals
500
The Noble Gasses are in group ________.
18
500
A family of elements that has two electrons in its outer energy level is the ___________.
Alkaline Earth Metals
500
Elements that lie along a stair-step line of the periodic table are __________.
Metalloids
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