PHY 103 - 2A ATOM
A nucleon has a mass of about
1 atomic mass unit or 1 amu
Compared to the mass of a hydrogen atom, the mass of an oxygen atom is
16 times as great
What is the molecular mass of a water molecule?
18 amu
Which of the following is not a compound?
air
A force that determines the chemical properties of an atom is
an electrical force
Which of these investigators did not contribute to our knowledge of atoms?
aristotle
A pair of helium nuclei fused together produces
beryllium
Two protons removed from an oxygen nucleus result in
carbon
What is the lightest particle?
electron
The chemical properties of matter are due to mostly their
electrons
The volume of matter is due mostly to its
electrons
An isotope is simply an atom that
has different numbers of neutrons for the same element
A pair of hydrogen nuclei fused together produces
helium
One neutron added to a helium nucleus results in
helium
Which of the following is an inert gas?
helium
Which of these has the greatest number of protons in its nucleus?
lead
Which of the following is true?
molecules are the smallest subdivision of matter that still retain a substance's chemical properties
A granite block is mostly space because the atoms in the granite are
mostly empty space themselves
Two protons added to an oxygen nucleus produce
neon
Which of the following is a gas?
neon
Which of the following is electrically neutral?
neutrons
Which of the following is not a mixture?
none of the above
Mass number refers to the number of
nucleons in the nucleus
Although solid matter is mostly empty space, we don't fall through the floor because
of electrical forces
The number of protons in a neutral atom is balanced by an equal number of
orbital electrons
Brownian movement is caused by
particles larger than atoms bumping into them
An element is distinct because of its number of
protons
The mass of matter is due mostly to its
protons
Atomic number refers to the number of
protons in the nucleus
Which is the smallest particle?
quark
Compared to the atoms that make up the body of an elderly person, the atoms that make up the body of a newborn baby are
the same age
Which of the following statements is true?
there are only about 100 different kinds of atoms that combine to form all substances
What is the total number of individual atoms in a water molecule?
three
How many different kinds of elements are in a water molecule?
two
Which of the following elements has the most mass?
uranium
Which of these atoms has the greatest amount of electrical charge in its nucleus?
uranium
Which of these atoms has the greatest number of electrons?
uranium
An ion and an isotope are
very unlike
