Introduction to Atoms
Organizing the Elements
Metals
Nonmetals, Inert Gases and Semi Metals
Radioactive Elements
100
What are the 3 particles that make up atoms and their charges?
What is protons (positive), Neutrons (neutral) and Electrons (negative)
100
What is the name for the horizontal rows in the periodic table?
The horizontal rows are called Periods
100
Which metal group is the most reactive?
The Alkali metal group is most reactive.
100
List 4 properties of nonmetals.
1. Dull 2. Brittle 3. Poor conductors of electricity 4. Poor conductors of heat
100
This French Scientist accidentally discovered the effects of radioactive decay.
Henri Becquerel
200
The atomic number of an atom is determined by the number of what?
What is Protons
200
Who published the first periodic table of elements?
Dmitri Mendeleev published the first periodic table of elements
200
What 2 metal groups are pulled out and placed below the periodic table?
1. lanthanides 2. actinides
200
What is the name of the group with some properties of metals and some properties of nonmetals?
Semimetals have some properties of both metals and nonmetals.
200
This type of decay can be stopped by a piece of paper
Alpha particles
300
What is the center of the atom called and what particles are found there?
The Nucleus is the center of an atom where Protons (+) and Neutrons(Ø) are found.
300
What is the Chemical symbol and atomic mass of this element square?
Be
300
What are 2 physical properties of metals
1. Malleable 2. Ductile 3. Good conductors of heat 4. Good conductor of electricity 5. Luster
300
What is another name for inert gases?
Noble Gases
300
What particles make up an alpha particle?
2 protons and 2 neutrons make up an alpha particle
400
What is an isotope?
An atom with different number of neutrons (Ø).
400
The periodic table is made mostly of what group?
Transition metals or Metals
400
What is the definition for malleable?
Able to hammer into shapes.
400
Which Periodic table group is the least reactive
The Noble Gases
400
In what type of decay does 1 neutron turn in to 1 proton plus a fast moving particle?
Beta Decay
500
Why do atoms have a neutral charge?
Atoms are neutral because there are the same amount of (+) protons and (-) electrons.
500
How is the periodic table organized?
By Atomic Number
500
What does Ductile mean?
To be able to pull into a long wire.
500
What is the most dangerous type of radioactive decay?
Gamma Decay
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