Review Atoms, Molecules and Compounds

The smallest unit of life is

• an atom

• an element

• an electron

• a cell

The smallest unit of matter is

• a cell

• an atom

• an element

• an electron

A molecule is composed of

• more than two atoms

• more than one element

• only one element

• two or more cells

Which of the following is not an atomic particle?

• nucleus

• neutron

• electron

• proton

The atoms of each element have a unique number of

• electrons

• protons

• neutrons

• organelles

Which of these items is the smallest?

• cell

• molecule

• organelle

• atom

Which of the following determines an element's atomic mass?

• protons

• neutrons

• electrons

• nucleus

Which of the following determines the atom's charge?

• number of electrons

• number of neutrons

• number of protons

• number of cells

What are the main differences between compounds and molecules?

• compounds are made of the same elements

• molecules are made of the same elements

• molecules are held together by covalent bonds

• compounds are made of atoms of elements bonded in a certain ratio

Which type of bond occurs when atoms share electrons?

• ionic

• covalent

• hydrogen

• bail