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Flashcards in The Atom Deck (36):
1

The indivisible particles Leucippus and Democritus said would be the result of dividing matter again and again

atoms

2

The model John Dalton adopted (also by Leucippus and Democritus)

spherical model

3

Who made the plum pudding model and said that atoms are actually divisible (with electrons in a sea of positive charge)?

JJ Thomson

4

Who did the alpha scattering experiment on thin gold foil (showing positive alpha particles passed through most of the atom)?

Ernest Rutherford

5

The atom is mostly open/closed space

Open

6

Atoms of different elements have ____ positive charges

different

7

Who discovered protons?

Eugen Goldstein

8

Who discovered neutrons?

James Chadwick

9

Who developed the Planetary model (showing electrons orbiting in specific energy levels)?

Niels Bohr

10

What model did Ernest Rutherford develop?

Nuclear Model

11

Who said particles such as electrons exhibit wave like behavior?

Louie de Broglie

12

Who revised Bohr's model?

Erwin Schrödinger

13

What did Werner Heisenberg say about modeling electrons?

It is mathematically impossible to know the position and momentum of an electron at a specific time

14

The region electrons are most likely to be found

atomic orbitals

15

What is in John Dalton's theory?

1. Elements are composed of small particles called atoms
2. Law of Conservation of Mass (total mass of reactants = total mass of products)
3. Law of Definite Proportion or Composition
4. Law of Multiple Proportions

16

What does the law of definite proportion mean?

H2O = 1 hydrogen for every 2 oxygen and vice versa

17

What does the law of Multiple proportions mean?

atoms can combine or separate to make variations of a product in different proportions (carbon and oxygen can make CO2 or CO)

18

What are the nucleons (found in nucleus)?

protons and neutrons

19

Who discovered the photoelectric effect?

Heinrich Hertz

20

What did Albert Einstein theorize for light?

Existence of packets of light now called photons

21

Who proposed that the momentum (frequency) is inversely proportional to the wavelength?

Louie de Broglie

22

What does the principal quantum number represent?

shell or energy level

23

What does the Azimuthal quantum number represent?

electron subshell

24

What does the magnetic quantum number represent?

orbital

25

What does the spin magnetic quantum number represent?

magnetic spin

26

No two electrons can have the same set of quantum numbers

Pauli's Exclusion Principle

27

Electrons occupy singly before pairing up

Hund's Rule of Maximum Multiplicity

28

Electrons occupy the lowest available energy levels before filling higher levels

Aufbau Principle

29

Who devised the Modern Periodic Table of Elements?

Dmitri Mendeleev

30

Materials that have properties in between metals and non metals

Metalloids

31

what is electronegativity?

ability to attract an electron

32

what is ionization energy?

energy needed to remove an electron

33

what is electron affinity?

energy released when a gaseous atom gains an electron

34

what are ions?

atoms that have lost or gained electrons (changing its charge)

35

positively atoms are smaller than neutral atoms, true or false?

true

36

why are anions larger than the neutral atom?

because there are more electrons in the cloud