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Atoms
Elements Everywhere!
Periodic Table
Periodic Table 2
Hodgepodge!
100
What is an atom? What is an element?
An atom is the smallest particle of an element that still has the properties of that element. An element is a substance that cannot be broken apart chemically into other substances. Elements are made up of atoms.
100
What is a compound?
A compound is a pure substance that is made up of two or more elements that are chemically combined.
100
What is the periodic table? What does the word periodic mean?
The periodic table is a table in which the elements are arranged by their properties. The table is standardized meaning that scientists all over the world can use it. Periodic means happening at regular times.
100
What is a metal?
Metals are usually shiny, can be bent or strectched, and conduct electricity. Most elements are metals.
100
Which of the following elements is a metal? oxygen, gold, carbon, and helium
gold
200
What are protons? neutrons? and electrons?
Protons are small, positively charged particles in the nucleus. Neutrons are small particles that lack charge in the nucleus. Electrons move around the nucleus and they are negatively charged.
200
Most compounds are made of molecules. What is a molecule?
A molecule is a group of two or more atoms chemically combined.
200
What are the three groups into which elements can be classified?
metals, nonmetals, and semimetals.
200
What are nonmetals?
Many nonmetals are gases. Solid nonmetals are usually dull in color, do not conduct electricity, do not bend or stretch very much, and break easily.
200
What is the smallest number of parts in a compound?
two
300
What is matter and what is it made up of?
Matter is something that has mass and takes up space. Matter is made up of atoms.
300
Although there are over 100 elements, nearly 99% of the Earth's crust is made up of how many elements?
only 8!
300
What information is displayed in each box of the periodic table? What is the chemical symbol?
The box for each element lists the atomic number, chemical symbol, and name.
300
Why are the chemical symbols different colors on the periodic table? What do they mean?
They are different colors to tell you whether the element is a solid, liquid, or gas at room temperature. Red is gas. Blue is liquid. Black is solid.
300
Why did Dmitri Mendeleyev leave bland spaces in his first creation of the periodic table?
He believed elements discovered later would fit in there.
400
How can you see an atom? What is the tool called?
You can only see an atom with a special microscope. This microscope is called a scanning tunneling microscope or STM.
400
What are the four main groups of carbon compounds?
The four main groups of carbon compounds are carbohydrates, proteins, lipids, and nucleic acids.
400
What is the atomic number? If an element has an atomic number of 31, how many protons and electrons does that element have?
The atomic number is the number of protons in the nuclei. If an element has an atomic number of 31, they have 31 protons and 31 electrons.
400
What are noble gases?
Noble gases are the elements that hardly ever combine with other elements to form compounds.
400
Where are semimetals found on the periodic table?
They are found in the middle, between the metals and the nonmetals.
500
What are some examples of an elements properties?Why do different elements have different properties?
Examples of an elements properties are color, hardness, and density. Atoms joing together in different ways which determines their properties. For example in graphite carbon atoms are arranged in sheets so they can separate easily. In a diamond, carbon atoms are bonded tightly to other carbon atoms.
500
A student is studying a compound. She finds that it is made up of only three elements: carbon, hydrgen, and oxygen. Is this enough information to identify the compound?
No, because these elements can combine into may different compounds, including a wide variety of carbohydrates.
500
How are metals and nonmetals different?
Metals are susually shiny, can be bent or stretched, and conduct electricity. Nonmetals are usually dull, break easily, and do not conduct electricity.
500
Who developed the periodic table?
Russian chemist Dmitri Mendeleyev
500
How can a small number of elements form a huge variety of matter?
Atoms of elements join together in different combinations.