Fill in the blank
A[n] _____ is a particle in an atom with a positive charge _____ small particles that make up most types of matter on earth
Proton Atoms
Matter is anything that you can see and that takes up space
false has mass
#of protons 2 #of neutrons _____ # of electrons 2 Atomic#2 Mass#4
2
why is it impossible for the atomic number of an element to be greater than its mass number?
Because the mass number is the number of protons plus neutrons.
The atomic number of an element tells the number of _____ in the nucleus of the atom of that element
protons
During Chadwick's experiments streams of ______ were unaffected by an electric field _____ developed a model called the atomic theory of matter
neutrons John Dalton
Fruit salad is an example of a heterogeneous mixture
True
# of protons 3 # of neutrons 4 # of electrons 3 Atomic#____ Mass # 7
3
Why can you write a formula for a compound but not a mixture?
You cant write a formula for a mixture because there is a variaty of things in a mixture and we don't know what the ratio is
Air is an example of a _______
heterogeneous mixture
an atom of the element with atomic number 6 always has ______ ______ is not an example of matter
6 protons in its nucleus air
Metalloids are elements that have characteristics of both metals and nonmetals
True
# of protons ____# of neutrons 6 # of electrons 6 Atomic #____ Mass #12
6 6
Thomson's model of the atom pictured electrons embedded in a ball of positive charge. why did Rutherford's gold foil experiment lead to change in this model?
Most of the atom is empty space. The weight is concentrated in the nucleus.
most elements found on the left side of the periodic table are _______ water is an example of a[n] ______
metals compound
Rutherford's experiment showed that most of an atom is made up of _____ A property NOT considered to be a single substance is a [n] _____
empty space brittleness
A compound with the formula C6 H12 O6 is made up of three atoms
False 24
# of protons 11 # of neutrons 12 # of electrons ____ Atomic # 11 Mass #_____
11 23
The particles may be electrons-negative charge, alpha particles-positive charge, or neutrons-no charge. Identify the particles that make up each stream and explain your reasoning.
neutrons because they are not effected
Compare and contrast the properties of a homogeneous mixture such as salt and water and a heterogeneous mixture such as muddy water.
Salt water is a homogeneous mixture because the salt is evenly distributed throughout. Muddy water is a heterogeneous mixture because it is not evenly distributed throughout.
Isotopes of an element contain different numbers of _______ matter that is NOT considered to be a single substance is a[n] _____
neutrons mixture
JJ Thompsons experiments with cathode rays led to the discover of the neutron
False electrons
#of protons ____ #of neutrons 18 #of electrons ____ Atomic #_____ Mass # 35
17 17 17
The particles may be electrons-negative charge, alpha particles-positive charge, or neutrons-no charge. Identify the particles that make up each stream and explain your reasoning.
electrons because they are attracted to the positive charge alpha particles because they are attracted to the negative charge
Compare and contrast the composition of a compound having the formula HO with one having the formula H2O
The formula H2O has 2 hydrogen but HO just has 1 and they both have hydrogen