atomic structure

Question 1

Who gave the idea of atomos, invisible, Indivisible, infinite

Answer 1

Greek philosopher :leucippus & Democritus 440 B.C

Question 2

Who gave modern atomic theory and when

Answer 2

John Dalton, 1803

Question 3

Discovery of proton

Answer 3

1886,goldstien, perforated cathode in crooks discharge tube

Question 4

Discovery of electron

Answer 4

1897,j.j.thompson

Question 5

Discovery of nucleus

Answer 5

1911,Ernest Rutherford

Question 6

The idea for energy levels for electrons was proposed

Answer 6

1913

Question 7

Discovery of neutron

Answer 7

1932,james Chadwick, artificial radioactivity experiment

Question 8

Who when oil drop experiment

Answer 8

Robert Andrews Millikan, 1909

Question 9

Who calculated the charge of electron

Answer 9

Millikan, oil drop experiment

Question 10

Electron occupy…… Greater volume than…….. But form less than….. Total mass of an atom

Answer 10

100000,nucleus, 1%

Question 11

Mass of electron is…….. Times…… Than proton and…… Times…. Than neutron

Answer 11

1836,less, 1839,less

Question 12

…… Mass of an atom exists in nucleus

Answer 12

99.94%

Question 13

All elements have different number of…….

Answer 13

Proton

Question 14

James Chadwick experiment equation

Answer 14

Be+ he——-C+n

Question 15

Neutrons are…….. Than protons

Answer 15

Slightly Heavier

Question 16

Stability of nucleus depends upon the

Answer 16

Neutrons

Question 17

Mass of e in amu, g

Answer 17

0.00055, 9.11×10^-28 g

Question 18

Mass of proton in amu, g

Answer 18

1.0073,1.673×10^-24 g

Question 19

Mass of neutron in amu, g

Answer 19

1.0086,1.674×10^-24 g

Question 20

Bohr theory when, who, based on?

Answer 20

Danish physicist Ni el Bohr, 1913,based on planks quantum thoery