Mendeleev's Table
True/False: Mendeleev's table is complete and has all elements.
False
Columns are called groups in the periodic table. Rows are called _______________.
Periods
One property of metals is that it has high ___________ ________
boiling points
6
Which class falls in the middle of metals and nonmetals?
metalloids
Mendeleev used a strategy to figure out how to group his elements. What did he make to determine the layout of his table?
Cards that had element name and atomic mass
Instead of 8 in each group like Mendleev's table, how many are in the modern groups?
18
One property of metals explains why so many pots and pans are made of metal. Which property is this?
They conduct heat well
Name a property of nonmetals
they have low boiling points, they are poor conductors of heat, they're dull and brittle (any one is acceptable)
Elements that are close together usually have similar ___________.
properties
Mendeleev's groups, or columns, had how many elements in each group?
8
What does the atomic number represent on each element?
The number of protons
What does it mean to say a metal is "ductile"?
It can be pulled into long thin shapes, like wire
What word explains how the nonmetals vary in the way they are when put with chemicals?
reactivity
Which nonmetal is a gas that is very reactive and used for signs?
neon
What is one missing element from Mendeleev's table?
gallium, for example
Unlike Mendeleev's table which organizes the elements by atomic mass, the modern table organizes the elements by _________ __________
atomic number
What does it mean to say metals are malleable?
They can be hammered into thin sheets without breaking, or can be dented without shattering
A lot of nonmetals are not solids, rather they are ______
gases
Which metalloid is highly dangerous in liquid form?
arsenic
Why was Mendeleev's table so genius and so important?
It paved the way for discoveries of new elements years later
What are the 3 classes in the periodic table?
metals, metalloids, and nonmetals
Which metal is the only one that is not solid at room temperature?
Mercury
How are metalloids similar to both metals and nonmetals? (One thing each as a property)
they're shiny like metal, but brittle like nonmetals
Which metalloid is found in Earth's crust and is also used in construction?
silicon