atomic structure

Question 1

what year did John dalton make his version of the periodic table

Answer 1

1803

Question 2

what year did j.j. Thomson make his version of the periodic table

Answer 2

1897

Question 3

what year did Ernest Rutherford make his version of the periodic table

Answer 3

1909

Question 4

what was the first part of daltons 3 part atomic theory

Answer 4

All​ ​substances​ ​are​ ​made​ ​of​ ​atoms.​ ​Atoms​ ​are​ ​small​ ​particles​ ​that​ ​cannot be​ ​created,​ ​divided,​ ​or​ ​destroyed.

Question 5

what was the second part of daltons 3 part atomic theory

Answer 5

Atoms​ ​of​ ​the​ ​same​ ​element​ ​are​ ​exactly​ ​alike,​ ​and​ ​atoms​ ​of​ ​different elements​ ​are​ ​different

Question 6

what was the third part of daltons 3 part atomic theory

Answer 6

Atoms​ ​join​ ​with​ ​other​ ​atoms​ ​to​ ​make​ ​new​ ​substances.​ ​

Question 7

how did Thomson conduct experiments

Answer 7

used a cathode-ray tube

Question 8

what was Thomsons proposal for the model of an atom

Answer 8

the “plum-pudding” model

Question 9

what was the “plum-pudding” model

Answer 9

in which​ ​negative​ ​electrons​ ​are​ ​scattered​ ​throughout​ ​soft​ ​blobs​ ​of​ ​positively charged​ ​material.

Question 10

what did the cathode ray tube show

Answer 10

Because​ ​the​ ​beam​ ​moved​ ​away​ ​from​ ​the​ ​negatively​ ​charged​ ​plate​ ​and​ ​toward
the​ ​positively​ ​charged​ ​plate,​ ​Thomson​ ​knew​ ​that​ ​the​ ​particles​ ​must​ ​have​ ​a
negative​ ​charge

Question 11

relative charge of a proton

Answer 11

+1

Question 12

relative charge of a neutron

Answer 12

0

Question 13

relative charge of an electron

Answer 13

-1

Question 14

relative mass of a proton

Answer 14

1

Question 15

relative mass of a neutron

Answer 15

1

Question 16

relative mass of an electron

Answer 16

1/1836 (almost zero)

Question 17

why are atoms neutral

Answer 17

atoms are neutral because they contain the same amount of protons as electrons so the charges cancel each other out

Question 18

where is most of the mass of an atom concentrated in

Answer 18

the nucleus

Question 19

what are isotopes

Answer 19

isotopes are different atoms of the same element containing​​the same number of protons but different numbers of neutrons in their nuclei

Question 20

how to calculate the number of neutrons

Answer 20

mass number - atomic number

Question 21

what differs isotopes from each other

Answer 21

isotopes ​​have ​​the​​ same​​number ​​of ​​protons ​​but​​different ​​numbers ​o​f neutrons,​ ​they​ ​are​ ​still​ ​atoms​ ​of​ ​the​ ​same​ ​element,​ ​but​ ​they​ ​have​ ​different atomic​ ​masses