Science Definitions

Question 1

Electron:

Answer 1

Negative charge, small mass, found in the electron cloud that surrounds the nucleus

Question 2

Proton:

Answer 2

In nucleus, positive charge, heavy, mass of 1

Question 3

Neutron:

Answer 3

Located in nucleus, neutral charge, mass of 1

Question 4

Atomic number:

Answer 4

of an element equals the # of protons in the nucleus

Question 5

Mass number:

Answer 5

Sum of protons & neutrons in nucleus

Question 6

Isotope:

Answer 6

Atoms of same element that have diff #’s of neutrons & diff mass #’s

Question 7

Hypothesis:

Answer 7

Educated guess based on observation

Question 8

Law:

Answer 8

Summary of a pattern in nature, describes what happens

Ex: gravity, nursia

Question 9

Theory:

Answer 9

Explain patterns, explain why something happens, never proven to be correct, best & most complete explanation of a phenomenon, become stronger if evidence continues to support it, may be modified

EX: evaluation, Big Bang

Question 10

Model:

Answer 10

Representation of something

Question 11

Atom:

Answer 11

Makes up everything, contains protons, neutrons, and electrons, contains mass, cannot be seen by naked eye

Question 12

Nucleus:

Answer 12

Center core of atom, has a positive charge, contains most of atoms mass