Q3: Lesson 2 | Atoms

Question 1

said all matter is composed of small invisible particles called atoms

Answer 1

democritus - atomism

Question 2

said that atoms are invisible, and compounds are combinations of different types of atoms

Answer 2

john dalton - solid sphere model

Question 3

said that electrons are orbiting in a set, predictable paths around fixed, positively charged nucleus

Answer 3

ernest rutherford - nuclear model

Question 4

said that electrons are arranged in concentric specific circular orbits around the nucleus

Answer 4

neils bohr - planetary model

Question 5

the locations of the electrons could only be described as being part pf a cloud around the nucleus

Answer 5

erwin schrodinger - quantum model

Question 6

*tells us how many protons are present in one atom
of that element

Answer 6

atomic number

Question 7

*tells us how heavy an atom of that element is

Answer 7

mass number

Question 8

*different forms of the same element

Answer 8

isotopes

Question 9

*they have the same atomic number (Z) but
different mass numbers (A)

Answer 9

isotopes

Question 10

who discovered electrons

Answer 10

jj thompson

Question 11

who discovered the nucleus

Answer 11

ernest rutherford

Question 12

tried to explain presence of specific colors in hydrogens spectrum

Answer 12

niels bohr

Question 13

revision of rutherfords nuclear model

Answer 13

neutron model