The smallest particle into which an element can be divided and still be the same substance is called a(n)
What particle did J.J. Thompson discover?
How would one describe the nucleus?
Where are electrons likely to be found?
Dalton believed that
What did Democritus, Dalton, Thompson, Rutherford & Bohr all have in common?
In Thompson's "plum-pudding" model of the atom, (our chocolate chip cookie dough model), the plums (chocolate chips) represent
An atom of gold with 79 protons, 79 electrons and 118 neutrons would have a mass number of
Which of the following has the least mass?
If an isotope of uranium, U-235, has 92 protons, how many protons does U-238 have?
How did Democritus describe atoms?
What is the current model of the atom called?
Which of the following subatomic particles has no electric charge?
An atom of carbon with 6 protons, 6 electrons and 6 neutrons would have an atomic number of
The discovery of which particle proved that the atom was not indivisible?
If H-1 has 1 proton, how many protons does H-2 have?
How many neutrons does an atom with an atomic number of 23 and a mass number of 51 have?
What took place in the late 1880's?
What is the meaning of the word "atom"?
Which statement about atoms is true?
Which statement about isotopes is true?
According to Rutherford, what was in the center of an atom?
Which phrase describes radioactive isotopes?
Isotopes exist because atoms of the same element can have different numbers of
The raised surfaces show
Who proposed this new model of an atom?
Periodic means
Periodic Law states that
Each vertical column on the periodic table is called a(n)
The elements to right of the zigzag line on the periodic table are called
Most metals are
Most of the elements in the periodic table are
Mendeleev arranged the elements by
Each horizontal row on the periodic table is called a(n)
Which one of the following tells you the physical state of an element at room temperature (270 C)?
How do the physical and chemical properties of the elements change?
Which element is necessary for substances to burn?
Transition metals are
Mendeleev found that the properties of the known elements followed a pattern that repeated every
Which element makes up about 80% of the air we breathe?
The elements to the left of the zigzag line on the periodic table are
The groups of elements that do not have individual names are called the
The carbon group contains two metalloids, both of which are used to make
Diamond and soot are very different, yet both are natural forms of
What element is used to make the most widely used compound in the chemical industry?
How could you describe most metals?
How many of the most recently discoved elements follow periodic law?
Which of the following elements should be the best conductor of electric current?
Which group contains elements that have six valence electrons?
Which of the following items is NOT found on the periodic table?