How is the Periodic Table arranged using atomic numbers?
The atomic numbers increase going from left to right across periods.
Which 4 factors did Mendeleev use to arrange his Periodic Table?
Density, color, melting point, atomic mass
Define periodic table.
The periodic table is a chart of elements arranged into rows and columns (periods and groups) according to their physical and chemical properties.
How did Moseley organize his periodic table?
Moseley organized his periodic table by increasing atomic numbers.
Be able to identify an element's name, atomic number, atomic symbol, and atomic mass, and state of matter by looking at the periodic table.
See page 98 of your notes for this.
Explain how scientists are able to determine a synthetic element's properties.
Scientists are able to look at the properties of other elements in the same groups and period to determine the properties of the synthetic element.
How are alkali metals and alkaline earth metals different. Use the following words: group, reactivity (or reactive), density.
Alkali metals are in group 1. Alkaline earth metals are in group 2. Alkali metals are extremely reactive. Alkaline earth metals are very reactive, but not as reactive as alkali metals. Alkali metals have the lowest densities of all metals. Alkaline earth metals have a low density, but it is not as low as alkali metals.
How are alkali metals and alkaline earth metals similar?
They are both found in nature only as compounds. They are both soft metals. They are both silvery in color.
What are the properties of transition elements?
great strength, high melting points, high densities, less reactive than other metals
Describe the arrangement of metals in the periodic table in terms of their properties.
Metallic properties decrease from left to right across the periods.
96% of the mass of the human body is made up of what 4 elements?
oxygen, nitrogen, carbon, and hydrogen
What are the nonmetal that are in group 15? (you will use your periodic table for this)
What are the nonmetal that are in group 16? (you will use your periodic table for this)
Oxygen, sulfur, selenium
Why weren't the noble gases included in Mendeleev's periodic table?
They weren't discovered until after Mendeleev constructed his periodic table.
Explain how hydrogen shows properties of both metals and nonmetals.
In its liquid form, hydrogen conducts electricity like a metal. It is very reactive like an alkali metal. Like some nonmetals, it is a gas at room temperature. Under the conditions found on Earth, hydrogen acts as a nonmetal.
How is a semiconductor useful?
A semiconductor is useful in electronic devices because it conducts electricity well at high temperatures and stops electricity from flowing at lower temperatures.
Be able to tell an element's atomic number whether it's a metal, nonmetal, or metalloid; and which group and period it is in by using your foldable periodic table.
Use Periodic Table