Molecules of Life

Question 1

fundamental building block of all substances

Answer 1

Atom

Question 2

Life’s unique characteristics start with the __________

Answer 2

properties of different atoms

Question 3

Atoms consist of _____ moving around a nucleus of _____ and _____
Charge

Answer 3

electrons; protons and neutrons

Question 4

Electrical property of some subatomic particles
Opposite charges ______; like charges _____

Answer 4

Charge; attract, repel

Question 5

Negatively charged subatomic particle that occupies orbitals around the atomic nucleus

Answer 5

Electron (e-)

Question 6

Positively charged subatomic particle found in the nucleus of all atoms

Answer 6

Proton (p+)

Question 7

Uncharged subatomic particle found in the atomic nucleus

Answer 7

Neutron

Question 8

Number of protons in the atomic nucleus

Answer 8

Atomic number

Question 9

Total number of protons and neutrons in the nucleus of an element’s atoms

Answer 9

Mass number

Question 10

A pure substance that consists only of atoms with the same number of protons

Answer 10

Element

Question 11

Forms of an element that differ in the number of neutrons their atoms carry
Changes the mass number, but not the charge

Answer 11

Isotopes

Question 12

Isotope with an unstable nucleus, such as carbon 14 (14C)

Answer 12

Radioisotope

Question 13

Process by which atoms of a radioisotope spontaneously emit energy and subatomic particles when their nucleus disintegrates

Answer 13

Radioactive decay

Question 14

Electrons travel around the nucleus in ______ ______ (_____)

Answer 14

different orbitals; shells

Question 15

distribution of electrons in an atom

Answer 15

Shell model

Question 16

Solitary atoms that have unpaired electrons

Answer 16

Free Radicals

Question 17

Attractive force that arises between two atoms when their electrons interact

Answer 17

Chemical bond

Question 18

Group of two or more atoms joined by chemical bonds

Answer 18

Molecule