Unit 2 Atomic Structure

Question 1

An element that has gained or lost electrons:

Accepted Answer

ion

Question 2

What is another name for the Thomson Model?

Accepted Answer

Plum Pudding Model

Question 3

Who proposed that e- occupy fixed positions and move in orbits around protons in nucleus?

Accepted Answer

Niels Bohr (Planetary Model)

Question 4

Who shot a narrow beam of alpha particles at a very thin sheet of gold foil?

Accepted Answer

Ernest Rutherford

Question 5

How many protons, neutrons, and electrons are in Potassium? (respectively)

Accepted Answer

19, 20, 19

Question 6

Which subatomic particles are located in the nucleus?

Accepted Answer

proton and neutron

Question 7

When an e- moves from a low to high level, the e- absorbs a _____________ of energy.

Accepted Answer

quantum mechanical model

Question 8

Which American scientist carried out experiments using oil drops to find quantity of e- charge?

Accepted Answer

Robert Millikan

Question 9

What is an atom?

Accepted Answer

smallest particle of an element (retains properties)

Question 10

Who believed that all substances were built from only 4 elements (air, fire, earth, water)?

Accepted Answer

Aristotle

Question 11

To determine # of e- for ions, subtract the charge of the ion from its:

Accepted Answer

atomic number

Question 12

Who predicted that moving particle or object had an associated wave? What field: Light U Matter

Accepted Answer

Louis de Broglie; Wave Mechanics

Question 13

What are nucleons?

Accepted Answer

Protons and Neutrons

Question 14

In an atom, the number of protons equals the number of________

Accepted Answer

electrons

Question 15

Millikan determined:

Accepted Answer

the ratio of the charge to the mass of an electron in 1916

Question 16

Who first suggested that matter was made of extremely small particles that could not be divided

Accepted Answer

Democritus

Question 17

What is the atomic number of gold?

Accepted Answer

79

Question 18

Who discovered electrons in 1897?

Accepted Answer

J.J. Thompson

Question 19

Atomic Number is:

Accepted Answer

number of protons or electrons

Question 20

How many protons does Vanadium have?

Accepted Answer

23

Question 21

Is an electron located in the electron cloud?

Accepted Answer

True

Question 22

Who discovered protons in 1886?

Accepted Answer

Eugene Goldstein

Question 23

Who is responsible for the first atomic theory?

Accepted Answer

John Dalton

Question 24

Rutherford proposed that the atom is mostly empty with almost all mass concentrated in the:

Accepted Answer

nucleus

Question 25

Atomic Mass is:

Accepted Answer

sum of protons and neutrons

Question 26

In an ion, the number of protons is equal to the number of electrons.

Accepted Answer

false

Question 27

How many electrons does a sodium ion, Na+, have?

Accepted Answer

an octet (full outer shell)

Question 28

JJ Thompson proposed that a cathode ray is a stream of ________ moving at high speed.

Accepted Answer

tiny negatively charged particles (electrons)

Question 29

Who created the quantum mechanical model?

Accepted Answer

Schrodinger

Question 30

What is the plum pudding theory?

Accepted Answer

electrons distributed evenly throughout atom w/ + material

Question 31

When and Who discovered the neutron.

Accepted Answer

1932; James Chadwick

Unit 2 Atomic Structure

Questions 31

Unit 2 Atomic Structure

Questions 31