Chapter 7- Atomic Structure Vocab

Question 1

Ernest Rutherford

Answer 1

Preformed the gold foil experiment where he discovered the small core nuclear. Everything is moving

Question 2

James Chadwick

Answer 2

Discovered the neutron and be worked on the Manhattan project

Question 3

Plum pudding model

Answer 3

Electrons are scattered around a positive atom

Question 4

Protons

Answer 4

Positively charged
Helps make up the nucleus
Helps identify the atom
Atomic number

Question 5

JJ Thomson

Answer 5

Plum puddling model- discovered the electron and proposed this model

Question 6

Quarks

Answer 6

Basic building blocks of protons/neutrons

Question 7

Atomic number

Answer 7

Number of an element is the number of protons in the nucleus of each atom of that element

Question 8

Mass number

Answer 8

Number of protons plus number of neutrons in the nucleas

Question 9

Isotopes

Answer 9

Atoms that have the same number of protons but different number of neutrons

Question 10

Atomic mass

Answer 10

Average mass of all isotopes of an element

Question 11

Weighted average

Answer 11

=atomic mass

Mass of each isotope • percent Abundance

Question 12

Cathode Rays

Answer 12

A beam of electrons emitted from a high vacuum tube

Question 13

Niels Bohr

Answer 13

Proposed the Bohr model

Question 14

Bohr model

Answer 14

Electrons can jump from a path in one level to a path in another level (Niels Bohr)

Question 15

John dalton

Answer 15

Atomic theory -
Atoms can’t be divided
Atoms of the same element are the same (untrue)
Atoms join to make new elements

Question 16

Democritus (atomic theory)

Answer 16

Proposed first atomic theory
Atoms are small hard indivisible and indestructible particles
Aristotle didn’t support

Question 17

Antoine Lavoisier

Answer 17

Father of modern chem
First to creat elements
Law of conservation of mass

Question 18

Explain how the existence of isotopes is related to the atomic mass not being whole numbers

Answer 18

Atomic mass is a weighted average