Show:
Small and Smaller
P.T. Facts
Then and Now
Did You Know
Show Me Your Skills
100
The smallest unit of an element that retains the properties of that element is called...
an atom
100
Elements on the periodic table are divided into three main categories; they are...
metals, metalloids, and nonmetals
100
Today, to view atoms, scientists use...
an electron microscope
100
Matter is anything that takes up ____________.
space
100
In what state is Krypton at room temperature?
gas
200
The nucleus of an atom contains...
neutrons and protons
200
Elements on the periodic table are arranged by...
the atomic number
200
Dmitri Mendeleev created the _______________ in 1869.
periodic table
200
Elements are known as the ___________________.
building blocks of life
200
Identify the atomic number of Zinc.
30
300
Particles with no electric charge are called...
Neutrons
300
Elements with similiar chemical properties are found on the same ______________ of the periodic table.
column
300
Aristotle, an ancient Greek philosopher, believed that there were only four elements. He believed they were...
earth, air, fire, and water
300
Most elements are in what state at room temperature?
solid
300
How many protons does Mercury have?
80
400
Most of an atom is ___________ space.
empty
400
The number of protons in an atom is the same as its ___________________.
atomic number
400
Today, Scientists know of just over ___________ elements.
112
400
When a molecule has different atoms, the properties of the molecule will be _____________ from the individual atoms.
different
400
Calculate the atomic mass of calcium.
40 amu
500
Most atoms in the world exist as part of a ___________, not on their own.
molecule
500
You can find the atomic mass of an atom by...
multiplying the atomic number by two
500
Today, Scientist now know that the width of one Hydrogen is about ______________ the width of a human hair.
one-millionth
500
Three properties of metals are...
conductivity, flexibility, and shiny luster
500
Give me 3 metalloids with an atomic mass of greater than 103 amu.
Te (Tellurium), Po (Polonium), At (Astatine)