Unit 5 Lesson 1

Question 1

proton

Answer 1

gives identity

equal to the atomic number

Question 2

element

Answer 2

simplest unit

Question 3

atom

Answer 3

basic unit

Question 4

given the credit who discovered protons

Answer 4

Eugen Goldstein

Question 5

where is electron?

Answer 5

outside the nucleus

Question 6

who discovered electron?

Answer 6

Joseph John Thomson or J. J. Thomson

Question 7

Nucleons

Answer 7

Protons and Neutrons

Question 8

who discovered neutron?

Answer 8

James Chadwick

Question 9

Atomic weight

Answer 9

Protons+Neutrons(because most of the weight are proton and neutron because they are heavy)

Question 10

Atomic number symbol

Answer 10

Z=p⁺

Question 11

Atomic Mass

Answer 11

A=p⁺+n⁰

Question 12

p⁺=e⁻ is true?

Answer 12

yes

Question 13

According to Democritus, the world is made up of tiny indivisible particles called

Answer 13

Atomos

Question 14

Non atomicism and atomicism

Answer 14

Aristotle and Democritus

Question 15

Arm chair scientists

Answer 15

Theorists?

Question 16

Indivisible,indestructable,Uncattle

Answer 16

Atomos

Question 17

proposed the solid sphere model of the atom in 1803

Answer 17

John Dalton

Question 18

made the plum pudding model of the atom

Answer 18

Sir J. J. Thomson

Question 19

discovery of the nucleus.

He proposed a new model which he called the nuclear model of the atom.

Answer 19

Lord Ernest Rutherford

Question 20

Most α particles passed straight through the gold foil, which showed that atoms are mostly empty space. The empty space is where?..Some of the α particles were deflected at various angles, and sometimes even back at the radioactive source

Answer 20

l

Question 21

In 1913, he improved Rutherford’s model by adding the concept of orbits.

Answer 21

Neils Bohr

Question 22

are stable discrete regions where electrons do not experience spontaneous energy absorption and emission.

Answer 22

Orbits

Question 23

Also energy levels

Answer 23

Orbits

Question 24

It denotes a certain distance from nucleus.

Answer 24

energy levels

Question 25

Bohr’s model introduces the concept ___

___ ____of wherein each orbit (or energy level) has a definite amount of energy.

Answer 25

quantized energy levels

Question 26

The amount of released energy in the form of light is equivalent to a specific wavelength of light.

Answer 26

true

Question 27

The specific wavelength is observed as the atom’s resulting spectrum.

Answer 27

l

Question 28

Bohr’s model is useful in explaining observations on hydrogen and hydrogen-like atoms but fails to explain phenomena for larger atoms.
It cannot account for atoms with more than one electron that have spectral lines in pairs.

Answer 28

Fallbacks of Bohr Model

Question 29

developed the wave-particle duality in 1924.
According to his theory, subatomic particles, like electrons, can also act as waves, rather than definite particles with determinate positions.

Answer 29

Louis de Broglie

Question 30

The model also indicates that the exact position of an electron cannot be precisely determined.

Answer 30

l

Question 31

The uncertainty principle states that two paired variables cannot be simultaneously determined with precision in a quantum system.

Answer 31

l

Question 32

It denies the probability of having electrons in definite orbits as stated in Bohr’s model.

Answer 32

l

Question 33

It denies the probability of having electrons in definite orbits as stated in Bohr’s model.

Answer 33

l

Question 34

It denies the probability of having electrons in definite orbits as stated in Bohr’s model.

Answer 34

l

Question 35

Electrons in the quantum mechanical model are in regions called ___, where electrons can only most probably be foun

Answer 35

orbitals