biology quiz chapter 2

These are the smallest functional units of matter that form all chemical substances and that

cannot be further broken down by ordinary chemical or physical means.

• neutrons

• electrons

• atoms

• molecules

The atomic number of an atom is

• the number of protons in the atom.

• the number of neutrons in the atom.

• the number of protons and electrons in the atom.

• the number of protons and neutrons in the atom.

Which of the following represents the smallest functional unit of living organisms?

• atoms

• molecules

• water

• proteins

Oxygen has an atomic mass of 16 and an atomic number of 8.

• Oxygen has 16 neutrons.

• Oxygen has 8 electrons.

• Oxygen can form two bonds with other atoms.

• Oxygen has 16 neutrons and 8 electrons.

• Oxygen has 8 electrons and can form two bonds with other atoms.

The nucleus of an atom is composed of

• protons

• neutrons

• electrons

• protons and neutrons

• protons and electrons

Ernest Rutherford's key experiment on alpha particle bombardment of gold foil was

important to the development of

• detection methods for protons.

• alpha particle emitters.

• gold as an element.

• the modern model for atomic structure.

• the concept that atoms have a homogenous distribution of protons throughout the atom.

If a scientist were to shoot protons through an atom, for instance like Rutherford did with

gold foil, he or she would likely find that

• most of the protons passed straight through the atom.

• few of the protons passed straight through the atom.

• most of the protons deflected or bounced back from the atom.

• most of the protons would be absorbed by the atom.

The first, inner-most energy shell of an atom

• can have a maximum of 8 electrons.

• can have a maximum of 2 electrons.

• is called the 1s orbital and can have a maximum of 8 electrons.

• is called the 2p orbital and can have a maximum of 2 electrons.

If carbon has an atomic mass of 12 and an atomic number of 6 then it has

• 6 electrons

• 12 electrons

• 18 electrons

• as many as 6 but no more than 12

Tritiated hydrogen (3H) differs from hydrogen (1H) in that

• 3H has 2 more protons than 1H.

• 3H has 2 more electrons than 1H.

• 3H has 2 more neutrons than 1H.

• 3H has the same number of neutrons as 1H.