Vocab
Mendeleev’s arrangement of the elements became known as the
periodic table (of elements)
The three classes of elements are these.
metals, metalloids, and nonmetals
The atomic number tells you this.
the number of protons an atom of an element should have
Where are most of the metals located on the periodic table?
They are to the left of the zigzag line.
The horizontal rows on a periodic table are known as this.
periods
Which kind of element is most likely used to make semiconductors
metalloids
Mendeleev organized the elements of his periodic table according to this.
increasing atomic mass
What elements are liqiud at room temperature?
Bromine and Mercury
The vertical columns on a periodic table are called this.
groups
Properties of metals
shiny and conduct heat and electricity well.
The modern periodic table is organized according to this.
increasing atomic number
What is the atomic number for sodium?
11
is an abbreviation for the element’s name.
chemical name
Properties of nonmetals
poor conductors of heat and electricity, and are often dull and brittle
Elements in a group are similar because their atoms have the same number of.....?
valence electrons
How is mercury classified?
metal
the weighted average of the masses of all the naturally occurring isotopes of that element.
average atomic mass
What is an element?
a pure substance that cannot be divided into simpler substances by physical or chemical means
Why can't scientist find an element between oxygen and fluorine?
The elements are arranged in order of increasing atomic number. Oxygen has an atomic number of 8, and flourine has an atomic number of 9. There is no whole number between these two numbers, so an element cannot appear between them.
Find the element with the average atomic mass of 35.45. Which of the following is the chemical symbol for this element?
Cl