PHY 103 - 2A ATOM

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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


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