atom stuff

Question 1

Early atom ideas

Answer 1

Greeks coined the term Atomos

Question 2

John Dalton

Answer 2

called atoms spheres
helped understand them as blocks of nature

Question 3

JJ Thompson

Answer 3

Founded elecetrons
knew they were neutral
made plum pudding; positively charged circle with dots of electrons

Question 4

Ernest rutherford,

Answer 4

did the gold leaf experiment which deflected a few atoms, he reaklised that all of the weight was ina compact positive neucleas with electrons on the outisde.
Later found that the neucleas must be made of small particles

Question 5

Niels Bohr

Answer 5

proposed electrons orbit the neucleas in shells

Question 6

James Chadwick

Answer 6

provided evidence for neutrons

Question 7

atomic number

Answer 7

number below the letter, number of protons and hence electrons

Question 8

Mass number

Answer 8

above letter, protons + neutrons

Question 9

Whats an isotope

Answer 9

element with dif number of neutrons to protons- number of protons NEVER change

Question 10

Whats an Ion?

Answer 10

An atom with an overall pos or neg charge

Question 11

How many electrons can be held by each shell?

Answer 11

2
8
8
18

Question 12

What are nobel gases?

Answer 12

Eelements in group 0 that have a full charged shell of electrons so do not react

Question 13

whats an aqueos solution

Answer 13

substance dissolved in water