Structure of an Atom and the Periodic Table

Question 1

first person to actually describe the atoms is?

Answer 1

Democritus

Question 2

theory based on the law of conservation and of definite proportions

Answer 2

John Dalton’s atomic theory

Question 3

law of conservation of mass is
founded

Answer 3

antoine lavoiser

Question 4

father of
modern chemistry

Answer 4

antoine lavoiser

Question 5

Law of definite proportions was postulated by

Answer 5

joseph proust

Question 6

theory

if a compound is broken down into its
constituent element. The masses of the
constituent will always have the same
proportion regardless the quantity of
other substances.

Answer 6

law of proportion

will always have a
definite proportion whether we change
the quantity or now. However, if we
change the type of molecule to
another, there will be a different
proportion

Question 7

John Dalton’s Atomic Theory

EXCEPT:
* All matter consists of tiny particles called atoms
* An atom cannot be created, divided, destroyed, or converted to any other type of atom
* Atoms of different elements combine in simple whole-number ratios to produce compounds (stable combinations of atoms)
* Atoms of different elements have different properties
* Atoms of a particular element have unique properties
* Chemical change involves joining, separating, or rearranging atoms

Answer 7

*Atoms of a particular element have unique properties

identical properties**

Question 8

John Dalton’s Model

Answer 8

Solid Sphere Model (empty space)

empty siya kasi he has a ton of problem

Question 9

Theorist

His theory stated that atoms are indivisible, those of a given element are identical, and compounds are combinations of different types of atoms.

Answer 9

Dalton

Question 10

Model

Atoms aren’t indivisible - they’re composed from subatomic particles.

Answer 10

Solid Sphere (1803)

Question 11

Model

Recognised that atoms of a particular element differ from other elements.

Answer 11

Solid Sphere Model

Question 12

J. J. Thomson’s Model

Answer 12

Plum Pudding Model

si thomson naginvent ng sugar malay q teh

sugar plum increase blood sugar kaya puro positive lang

Question 13

He discovered electrons (which he called ‘corpuscles’) in atoms in 1897, for which he won a Nobel Prize.

Answer 13

Thomson

Question 14

Model

No nucleus, and didn’t explain later experimental observations.

Answer 14

plum pudding

Question 15

Model

It shows the atom as composed of electrons scattered throughout a spherical cloud of positive charge.

Answer 15

Plum Pudding

Question 16

Who’s model is the Nuclear (1911)?

Answer 16

Ernest Rutherford

Question 17

Theorist and Model

He fired positively charged alpha particles at a thin sheet of gold foil. Most passed through with little deflection, but some deflected at large angles. This was only possible if the atom was mostly empty space, with the positive charge concentrated in the centre: the nucleus.

Answer 17

Nuclear by Ernest

Question 18

Model

Realised that positive charge was localised in the nucleus of an atom.

Answer 18

nuclear

Question 19

<Model

Did not explain why electrons remain in orbit around the nucleus.

Answer 19

Nuclear

Question 20

He modified Rutherford’s model of the atom by stating that electrons moved around the nucleus in orbits of fixed sizes and energies.

Answer 20

BOhr

bored siya kaya minodify niya, stationary pa siya kasi fixed

Question 21

Model

Electron energy in this model was quantised; electrons could not occupy values of energy between the fixed energy levels.

Answer 21

planetary model

Question 22

Bohr’s Model

Answer 22

Planetary

Question 23

Model

Proposed stable electron orbits; explained the emission spectra of some elements.

Answer 23

Planetary

Question 24

Model

Moving electrons should emit energy and collapse into the nucleus; model did not work well for heavier atoms.

Answer 24

Planetary

he was not able to explain
how electrons are moving outside the
nucleus because these electrons does
not have a fixed position.

Question 25

Model and theorists

According to him, they only have orbits but was not
able to explain that these type of
model does not work at larger in terms
of the shell and energy levels. He was
only able to explain smaller atoms

Answer 25

Bohr’s planetary

Question 26

Who created the quantum model

Answer 26

Erwin Schrodinger

Question 27

Model

electrons do not move in set paths around the nucleus, but in waves.

Answer 27

quantum

Question 28

model

It is impossible to know the exact location of the electrons; instead, we have ‘clouds of probability’ called orbitals, in which we are more likely to find an electron.

Answer 28

quantum

Question 29

Model

Shows electrons don’t move around the nucleus in orbits, but in clouds where their position is uncertain.

Answer 29

Quantum

Question 30

Model

TOF. Planetary model is still widely accepted as the most accurate model of the atom.

Answer 30

F (quantum)

Question 31

whose evidences

• bombarded Beryllium with alpha particles from the natural radioactive decay of Polonium
• concluded that the unusually penetrating radiation consisted of uncharged particles having (approximately) the same mass as a protons

Answer 31

James Chadwick

Question 32

model

limitation is he doesn’t
mention the momentum of the
electrons

Answer 32

quantum

Question 33

independent developed the precurosr to oyr modern periodic table

Answer 33

dmitri mendeleev and lothar meyer

Question 34

Principle

it is impossible to measure accurately both position and momentum of a variable simultaneously.

Answer 34

Heisenberg Uncertainty

when you get the position of electrons, you don’t
get the momentum vice versa.

Question 35

Principle

helps determine electron configuration
- electron fill the lowest-energy orbital that is available

Answer 35

Aufbau

Question 36

Principle

each orbital can hold up to
two electrons with their spins
in opposite directions (paired)

Answer 36

Pauli’s Exclusion

Question 37

Principle

each orbital in a subshell is half-filled (with one electron) before any orbital becomes completely filled (with two electrons)

Answer 37

Hund’s Rule