Chapter 2.1

Question 1

Nucleus

Answer 1

the center of the atom which contains the protons and the neutrons; in cells, the structure that contains the cell’s genetic material and controls the cell’s activities

Question 2

Electron

Answer 2

a negatively charged particle located outside the atomic nucleus

Question 3

Element

Answer 3

a substance consisting entirely of one type of atom

Question 4

Isotope

Answer 4

atom of an element that has a number of neutrons different from that of other atoms of the same element

Question 5

Compound

Answer 5

a substance formed by the chemical combination of two or more elements in definite proportions

Question 6

Ionic Bond

Answer 6

a bond formed when one or more electrons are transferred from one atom to another

Question 7

Ion

Answer 7

an atom that has a positive or negative charge

Question 8

Covalent Bond

Answer 8

a bond formed by the sharing of electrons between atoms

Question 9

Molecule

Answer 9

the smallest unit of most compounds

Question 10

van der Waals forces

Answer 10

a slight attraction that develops between the oppositely charged regions of nearby molecules

Question 11

Atom

Greek term—atomas

Answer 11

basic unit of matter