Metals
What are some properties of metals?
What are some properties of nonmetals?
Relatively low boiling point, which explains why many of them are gases at room temperature.
Who developed the periodic table?
Mendeleev
Why are groups 13–16 different from the other groups of the periodic table?
Only groups that contain elements classified as metalloids. Unlike other groups of the periodic table, which contain elements in just one class, groups 13–16 contain elements in at least two different classes.
What is the name of the element with the symbol Rh?
Rhodium
What types of elements are in group 1 of the periodic table?
Hydrogen and Alkali Metals
What types of elements are in group 17 of the periodic table?
Halogens
What was the difference between Mendeleev’s periodic table & the modern periodic table?
The modern table arranges the elements by increasing atomic number instead of atomic mass & the modern table has more elements than Mendeleev’s table because many elements have been discovered since Mendeleev’s time.
Give an example of an alkaline earth metal we need in everyday life?
Calcium
What is the atomic mass of Iron?
55.85
What types of elements are in group 2 of the periodic table?
Alkaline Earth Metals
What types of elements are in group 18 of the periodic table?
Noble Gases
What are some properties of metalloids?
Have some physical properties of metals and some physical properties of nonmetal.
They fall between metals and nonmetals in their ability to conduct heat, and if they can conduct electricity, they usually can do so only at higher temperatures.
What is an electron dot diagram?
Simple diagrams that show only their valence electrons. In this type of diagram, an element's chemical symbol is surrounded by dots that represent the valence electrons.
What is the atomic number for Boron?
5
What types of elements are in groups 3-12 of the periodic table?
Transition Metals
Why are noble gasses the least reactive of all known elements?
With eight valence electrons, their outer energy levels are full.
How are valence electrons represented in the periodic table?
The number of valence electrons in an atom is reflected by its position in the periodic table of the elements.
Across each row, or period, of the periodic table, the number of valence electrons in groups 1–2 and 13–18 increases by one from one element to the next.
What is the symbol for Potassium?
K
What period is Calcium in?
4
What are some properties of transition metals?
Superior conductors of heat as well as electricity. They are malleable. They have high melting and boiling points, and all are solids at room temperature, except for mercury (Hg), which is a liquid. Transition metals are also high in density and very hard. Most of them are white or silvery in color, and they are generally lustrous, or shiny. The compounds that transition metals form with other elements are often very colorful.
How many valence electrons do halogens have?
7
What types of elements are in groups 13-16 of the periodic table?
Contain elements in at least two different classes. Only groups with metalloids.
To what group does Sodium belong to?
Group 1
Name two metalloids.
boron, silicon, germanium, arsenic, antimony, and tellurium.