Atomic Structure

Question 1

Who discovered positive rays

Answer 1

Eugen Goldstein

Question 2

What is other name for positive rays

Answer 2

canal rays

Question 3

When do positive rays produce fluorescence

Answer 3

When they strike zinc sulfide (ZnS)

Question 4

The charge to mass ratio of protons is always _____than cathode rays

Answer 4

less

Question 5

What is max charge to mass ratio of positive rays

Answer 5

9.54 . 10^7

Question 6

how many times heavier is proton to electron

Answer 6

1836

Question 7

What is other name for line spectrum

Answer 7

atomic spectrum

Question 8

What does sodium’s line spectrum show

Answer 8

two yellow lines

Question 9

What is flame colour of strontium and potassium

Answer 9

red and violet

Question 10

What did JJ Blamer discover?

Answer 10

four colours in hydrogen spectrum, red, blue-green, blue-violet, violet

Question 11

What region corresponds to Lyman series

Answer 11

Ultraviolet and electron returns to ground state

Question 12

What region corresponds to Balmer series

Answer 12

visible region, electron returns to 2nd energy level

Question 13

What region corresponds to Paschen series

Answer 13

near infrared, electron returns to 3rd energy level

Question 14

What region corresponds to Brackett series

Answer 14

mid infrared, electron returns to 4th energy level

Question 15

What region corresponds to Pfund series

Answer 15

far infrared, electron returns to 5th energy level

Question 16

What does Planks quantum theory state

Answer 16

E=hf

Question 17

What is angstrom unit

Answer 17

unit of wavelength. 1 angstrom= 10^-8 cm

Question 18

what is relationship of n and l

Answer 18

l=n-1

Question 19

what is relationship of m and l

Answer 19

m= 2l + 1

Question 20

What is Aufbau’s principle

Answer 20

building up principle, 1s, 2s, 2p,3s,3p,4s…..

Question 21

What is pauli’s exclusion principle

Answer 21

electrons in same orbital must have opposite spin

Question 22

What is hund’s rule

Answer 22

most stable arrangement is one with max parallel spins

Question 23

What does principle quantum number tell is

Answer 23

avg distance from nucleus, and energy level

Question 24

What does azimuthal quantum number (l) tell is

Answer 24

it tells us angular momentum, and shape and number of subshells

Question 25

What does magnetic quantum number tell us

Answer 25

orientation of orbital in space

Question 26

What does spin quantum number tell us

Answer 26

it describes spin of electron which can be found by external magnetic field

Question 27

Name elements in Group IB that have abnormal aufbau principle (ie 4s electron jumps to 3d)

Answer 27

copper, silver, gold

Question 28

Name elements in group VIB that have one electron jump from 4s to 3d

Answer 28

chromium, molybdenum (Mo) and tungsten (W)