Category 1
Category 2
Category 3
Category 4
Category 5
100
Who created the first Periodic Table?
Mendeleev
100
(Oxygen Family) What are the characteristics of the elements?
They have 6 valence electrons
show both nonmetallic and metallic character.
100
If an ion contains 10 electrons,12 protons and 13 neutrons,what is the ion's charge?
2+
100
What determines the order of elements on today's periodic table?
Increasing atomic number.
100
An atom is mostly made up of _____.
space.
200
What state of matter are most elements in the table
solid
200
What are their properties of metalloids?
*solid at room temperature
*luster
*brittle (non malleable)
*they conduct electricity better than nonmetals.
200
How is Bohr's atomic model different from Rutherford's model?
a)Bohr's model has a neutrons.
b)Bohr's model has electrons.
c)Electrons in Bohr's model are located farther from the nucleus.
d)Electrons in Bohr's model are located in circular energy levels.
d)Electrons in Bohr's model are located in circular energy levels.
200
The far right-hand column of elements are known as the ___________.
noble gasses
200
Which type of atoms pool their valence electrons to form a "sea of electrons"?
metals
300
What does malleable mean?
can be hammered or rolled into sheets and other shapes.
300
Where are Transition Metals located on the periodic table?
Group 3-12
300
How radioactive decay can produce new element?
Radioactive decay produces a new element by changing the number of protons in an atom's nucleus.
300
Electrons in the outer shell of an atom are called __________ electrons.
valence electrons
300
This element is considered the building block of life because it can form four bonds and create long chains of molecules.
carbon
400
(Alkali Metals) What are the characteristics of the elements (physical properties and reactivity)
Highly reactive and always present as compounds.
400
Hydrogen - Why is it alone in its group?
Because of it's chemical properties.
(Hydrogen is separated or placed uniquely on the periodic table because it exhibits a dual chemical nature, sharing properties with both Group 1 alkali metals and Group 17 halogens, while also behaving like a non-metal under normal conditions.)
400
Which scientist conducted the gold-foil experiment and discovered the nucleus?
Thomas Rutherford
400
What is covalent bonding?
This type of bond is formed when atoms share two or more valence electrons
400
Why it is possible for an oxygen atom to form a double covalent bond. But it is not possible for a chlorine atom to form a double covalent bond?
Oxygen atoms have 6 valence electrons. They are chemically stable with 8 valence electrons.Oxygen can form 2 single bond or one double bond.
Chlorine atoms have 7 valence electron and are stable with 8 valence electrons. Chlorine atom can form one single bond with another atom.
500
Why is mercury the only metal to have been used in thermometer?
Mercury is the only metal that is a liquid at room temperature.
500
What are the physical and chemical properties of METALS?
Shininess, malleability, ductility, and conductivity.
500
What are isotopes?
Atoms of the same element that contain different numbers of neutrons.
500
What connection does the human body have with the elements on the periodic table?
Oxygen,carbon,hydrogen and nitrogen make up 96% of the human body and combine to form essential life molecules.
500
Use periodic table to classify the elements.
potassium(K), bromine(Br), argon(Ar)
a) lose electrons to form positive ions.
b) gain electrons to form negative ions.
c) neither gain nor lose electrons.
a) K--- lose electrons to form positive ions.
b) Br-- gain electrons to form negative ions.
c) Ar-- neither gain nor lose electrons.